I’ll be adding books here that I reference in my posts and find useful.
Clicking on the book image or title will take you to the Amazon.com page for that book. Buying the book after clicking through from here helps support this site.

A Guide to North American Species
by Charley Eiseman and Noah Charney

by Paul Hillyard

by Charles L. Hogue

A Photo Guide
by James L. Castner

A Visual Reference
by Stephen A. Marshall

A Handbook of the Insects of America North of Mexico
by Ross H. Arnett, Jr.

Their Natural History and Diversity
by Stephen A. Marshall

by David L. Wagner

by Herbert W. Levi and Lorna R. Levi

by Twan Leenders

An Essential Guide to Insects and Spiders of North America and the World
by Rod and Ken Preston-Mafham

by Vincent H. Resh and Ring T. Carde

A Herptofauna between Two Continents, between Two Seas
by Jay Mathers Savage

by Manuel A. Zumbado and Fernando Zeledón

by David George Gordon

by Jan Beccaloni

by Jeffrey C. Miller, Daniel H. Janzen and Winifred Hallwachs

by John L. Capinera, Ralph D. Scott, and Thomas J. Walker

A Guide to the Genera
by Brian L. Fisher and Stefan P. Cover

by Charles V. Covell, Jr.

by David Beadle and Seabrooke Leckie

by L. L. Gaddy