Your failure to find what you consider an official source bursted my bubble of thinking you were capable of understanding a definition when found.
But it is nice to know you are comfortable with your private decision on whom to trust in these matters, even if you are deeply confused about who that really is.
I know I'll be able to understand when I find it because it will say in bold, underlined or otherwise highlighted words,
THIS IS THE OFFICIAL, FORMAL, HISTORICAL, CONFESSIONAL, VERBATIM DEFINITION OF THE CONCEPT/PRINCIPLE/PRAXIS/RULE/TEACHING/DOCTRINE of SOLA SCRIPTURA, complete with the scriptural reference which is also in bold, underlined or otherwise highlighted (including book, chapter and verse)...
THE SCRIPTURES ARE AND SHOULD REMAIN THE SOLE RULE IN THE NORMING OF DOCTRINE AMONG US....
I know this, because this is the standard that the sola scripturists have laid out for every one else.
So, here it is again, all seventeen words of the official, formal, historical, confessional, verbatim definition of the concept/principle/praxis/rule/teaching/doctrine of sola scriptura. Pay close attention, you might miss it:
In the pure churches and schools these public common writings have been always regarded as the sum and model of the doctrine which Dr. Luther, of blessed memory, has admirably deduced from God's Word, and firmly established against the Papacy and other sects; and to his full explanations in his doctrinal and polemical writings we wish to appeal, in the manner and as far as Dr. Luther himself in the Latin preface to his published works has given necessary and Christian admonition concerning his writings, and has expressly drawn this distinction namely, that the Word of God alone should be and remain the only standard and rule of doctrine, to which the writings of no man should be regarded as equal, but to which everything should be subjected.
The Solid Declaration of the Formula of Concord - Book of Concord
I don't see the words sola scriptura anywhere nor do I see any scriptural references given. What I do see, is sola scripturists clinging to all seventeen words of their pet slogan as though they were written by God. They weren't written by God, they were penned by Lutheran churchmen in 1577.
Again, the official, formal, historical, confessional, verbatim definition of the concept/principle/praxis/rule/teaching/doctrine of sola scriptura offered to us by the author of post #11 doesn't make any leeway for the personal reading and private judgement of the bible by 21st century savants. No, it merely says that the bible will be the sole rule for norming doctrine among Lutherans.
Since you aren't a Lutheran, and since you're not norming any dogma the official, formal, historical, confessional, verbatim definition of the concept/principle/praxis/rule/teaching/doctrine of sola scriptura offered to us by the author of post #11 is not for you. Furthermore, in the past, I've heard you avow an alleged feature of the concept/principle/praxis/rule/teaching/doctrine of sola scriptura namely, that scripture interprets scripture. That isn't a part of the definiton offered to us in post #11. No, if your read along in your Book of Concord your will find that the authors find other writings useful :
For that we embodied the above-mentioned writing, namely, the Augsburg Confession, Apology, Smalcald Articles, Luther's Large and Small Catechisms, in the oft-mentioned Sum of our Christian doctrine, was done for the reason that these have always and everywhere been regarded as the common, unanimously accepted meaning of our churches, and, moreover, have been subscribed at that time by the chief and most enlightened theologians, and have held sway in all evangelical churches and schools.
I'm not sure if you find those writings to be of any use, but the 1689 Baptist Confession doesn't . They say:
9. The infallible rule of interpretation of Scripture is the Scripture itself; and therefore when there is a question about the true and full sense of any Scripture (which is not manifold, but one), it must be searched by other places that speak more clearly.
1689 Baptist Confession Chapter 1
While this sounds like something you've said, again, nothing in the Baptist Confessions definition of sola scriptura makes any provision for your private judgement and personal bible reading. So what gives? What definition of sola scriptura are you using, one of your own making?