Non-LDS Books
Keepers of the Keys: A History of the Popes from St. Peter to John Paul II by Nicholas Cheetham
Christianity: A Global History by David Chidester
Return From Tomorrow by George C. Ritchie & Elizabeth Sherrill
Life After Life by Raymond Moody
LDS Books
A Marvelous Work and A Wonder by LeGrand Richards (available in hardback, paperback, and ebook formats. Also available on Amazon)
Life Everlasting by Duane S. Crowther (Also available on Amazon)
From Critic to Convert by Willard Morgan (Also available on Amazon)