All of your sources are nonofficial.
Incorrect.
1) "Mormon Doctrine" is not copyright "Church of Jesus Christ of Latter-day Saints" or "Intellectual Reserve". It is not an official LDS publication. (It's published by Bookcraft Pubs and copyright owned by the author's family).
2) There are no official "third party" LDS publications.
3) "Mormon Doctrine" was not written by a top church leader, nor was it authorized by the top LDS church leaders. In fact, they were not even informed it was being written till after publication.
4) "Mormon Doctrine" was so riddled by errors.
5) Mormons do not even have seminaries like other Christian groups. (An LDS seminary is a high school class).
Again, nonofficial. Published and copyrighted by the author, whom was also not a church leader.
True: things published by BYU are not official Mormon church publications. They're BYU publications.
Which does not make it an official Mormon publication. Mormon bookstores also sell Harry Potter because...it's a bookstore!
your premise is self defeating,
because if books are not official because they are lacking publishing from LDS avenues,
then BYU, and all their degrees, diplomas, and other peer review are officially not withing the pale of orthodoxy for a Mormon to engage in.
and lastly Brigham young and Joseph smith's works would not be divine because they predated LDS organizations in an official manner.
you can come up with whatever rule you wish, but you must obey it fully.
“Shall I tell you the law of God in regard to the African race? If the white man who belongs to the chosen seed mixes his blood with the seed of Cain, the penalty, under the law of God, is death on the spot. This will always be so” (Journal of Discourses, vol. 10). "
"
2 NEPHI 5:21
And he had caused the cursing to come upon them, yea, even a sore cursing, because of their iniquity. For behold, they had hardened their hearts against him, that they had become like unto a flint; wherefore, as they were white, and exceedingly fair and delightsome, that they might not be enticing unto my people the Lord God did cause a skin of blackness to come upon them.
And thus saith the Lord God: I will cause that they shall be loathsome unto thy people, save they shall repent of their iniquities.
And cursed shall be the seed of him that mixeth with their seed; for they shall be cursed even with the same cursing. And the Lord spake it, and it was done.
And because of their cursing which was upon them they did become an idle people, full of mischief and subtlety, and did seek in the wilderness for beasts of prey."
"Who placed the Negroes originally in darkest Africa? Was it some man, or was it God? And when He placed them there, He segregated them....
The Lord segregated the people both as to blood and place of residence. At least in the cases of the
Lamanites and the Negro we have the definite word of the Lord Himself that he placed a dark skin upon them as a curse -- "-
Online College Level,
Brigham Young
University, Provo, Utah, August 27, 1954.-Elder MARK E. PETERSON