While the 'Standard Works' are the specifically identified scriptures of the Church of Jesus Christ of Latter-Day Saints, all other books are by definition excluded by them from the status of 'scripture', being purely the personal opinions of the their respective authors.
Interestingly every other book used for teaching by the LDS church while being an author's private opinion, is issued under the approval of the LDS church 'First Presidency' or 'Quorum of Twelve Apostles' (or both), printed and published by the LDS church owned media, and included by direction of the appropriate 'General Authorities' within the teaching program(me)s of the LDS church.
One wonders, therefore, how they can possibly be purely the authors' own opinions.
The 'Other Books' will include:
A Marvellous Work and a Wonder by LeGrande Richards
Mormon Doctrine by Bruce R McConkie
Talmage and McConkie were both members of the Twelve Apostles. Talmage was one while he wrote his book, and McConkie was promoted shortly after writing his.
LeGrande Richards was the senior of three members of the 'Presiding Bishopric' of the LDS Church, 'the' Presiding Bishop at the time.
Without doubt, this means that they would have to have known every vestige of LDS doctrine there was to know. Could they have written personal opinions that were NOT endorsed by the LDS church's governing body? Many of us find that unlikely.
Here is a link to a page with the flyleaf information from 'Jesus the Christ', and you may be the judge whether or not this apostle had the confidence of his brethren...
Jesus the Christ by James E Talmage