B. H. Roberts writes on the history Joseph and plural marriage for an official Church history publication.
B. H. Roberts, A Comprehensive History of The Church of Jesus Christ of Latter-day Saints, rep. ed. , 6 vols. (Provo, UT: Brigham Young University Press, 1965), 2:93–110
[B. H. Roberts devotes a chapter in his Comprehensive History of The Church of Jesus Christ of Latter-day Saints on Joseph Smith and the origins of plural marriage, including a reproduction of affidavits attesting Joseph began the practice and a discussion of the theology pertaining to eternal and plural marriage.