I tend to reference the following books depending upon my needs:
Daniel Boxberger (editor), Native North Americans an Ethnohistorical Approach
de Bulj, Muller, and Ninjman, The World Today: Concepts and Regions in Geography
Ember and Ember, Cultural Anthropology
la Croix and Tansey, Gardener's Art Through the Ages 18th ed 1 Ancient, Medieval, and Non-European Art
Jared Diamond, Guns, Germs, and Steel
Fred Kleiner, Gardner's Art Through the Ages Non-Western Perspectives 13th ed
Oswalt and Neely, This Land Was Theirs: A Study of North American Indians
Stein and Stein, The Anthropology of Religion, Magic, and Witchcraft 3ed (I just realized my copy is missing from the shelf)
von Sivers, Desnoyers, & Stow, Patterns of World History v1 to 1600
Werner, Myths & Legends of China
Michael Echanis, Basic Stick Fighting for Combat
Michael Echanis, Knife Self Defense for Combat
Leo T. Fong, Choy Lay Fut Chinese Art of Self Defense
Leo T. Fong, SIl Lum Kung Fu The Chinese Art of Self-Defense
Jane Hallander, The Complete Kung Fu Fighting Styles
Joo Bang Lee, The Ancient Art of Hwarang do vol. 1-3
Peter Lewis, The Martial Arts Traditions A Beginner's Guides to the Techniques of Kung Fu, Karate, Taekwondo, and Ninjutsu
Peter Lewis, The Martial Arts Origins, Philosophy, Practice
Willie Lin, TIen Shan P'ai Kung Fu
A. Pluger, Karate Basic Principles
Scott Shaw, Hapkido Korean Art of Self Defense
Bruce Tegner, Bruce Tegner's Complete Book of Karate Second Revised Edition
Doc-Fai Wong and Jane Hallander Shaolin Five Animals Kung Fu
Douglas Wong, Deceptive Hands of Wing Chun,