The Silmarillion:
https://www.amazon.com/Silmarillion-J-R-R-Tolkien-April-Paperback/dp/B015QNID1I/ref=sr_1_2?ie=UTF8&qid=1494085777&sr=8-2
Bilbo's Last Song:
https://www.amazon.com/Bilbos-Last-Song-J-R-R-Tolkien/dp/0375823735/ref=sr_1_38?s=books&ie=UTF8&qid=1494084569&sr=1-38
J.R.R. Tolkien: A Biography:
https://www.amazon.com/J-R-R-Tolkien-Biography-Humphrey-Carpenter/dp/0618057021/ref=sr_1_1?s=books&ie=UTF8&qid=1494085555&sr=1-1
Another great source:
www.tolkiensociety.org
https://www.amazon.com/Silmarillion-J-R-R-Tolkien-April-Paperback/dp/B015QNID1I/ref=sr_1_2?ie=UTF8&qid=1494085777&sr=8-2
Bilbo's Last Song:
https://www.amazon.com/Bilbos-Last-Song-J-R-R-Tolkien/dp/0375823735/ref=sr_1_38?s=books&ie=UTF8&qid=1494084569&sr=1-38
J.R.R. Tolkien: A Biography:
https://www.amazon.com/J-R-R-Tolkien-Biography-Humphrey-Carpenter/dp/0618057021/ref=sr_1_1?s=books&ie=UTF8&qid=1494085555&sr=1-1
Another great source:
www.tolkiensociety.org