While it's incredibly hard to narrow down any list about favorite books, the following are at the top of mine:
Homeschooling
Dumbing Us Down: The Hidden Curriculum of Compulsory Schooling, 10th Anniversary Edition
Home Learning Year by Year: How to Design a Homeschool Curriculum from Preschool Through High School
A Charlotte Mason Companion: Personal Reflections on the Gentle Art of Learning
Home Style Teaching: A Handbook for Parents and Teachers
Home Style Teaching: A Handbook for Parents and Teachers
For the Children's Sake: Foundations of Education for Home and School
Honey for a Child's Heart
My Father's World
Honey for a Child's Heart
My Father's World
Inspiring
NASB Update Side-Column Reference; Black Genuine Leather
Bonhoeffer: Pastor, Martyr, Prophet, Spy
Same Kind of Different As Me: A Modern-Day Slave, an International Art Dealer, and the Unlikely Woman Who Bound Them Together
Same Kind of Different As Me: A Modern-Day Slave, an International Art Dealer, and the Unlikely Woman Who Bound Them Together
Prayer
The Power of a Praying® Wife Deluxe Edition
The Power of a Praying Parent
Holy Living
Homemaking
Literature for Kids
The Chronicles of Narnia
The Wrinkle in Time Quintet Boxed Set (A Wrinkle in Time, A Wind in the Door, A Swiftly Tilting Planet, Many Waters, An Acceptable Time)
The Swiss Family Robinson
Story Books
The Story about Ping (Reading Railroad Books)