Merriam-Webster's Biographical Dictionary
The Geography Bee Complete Preparation Handbook: 1,001 Questions & Answers to Help You Win Again and Again!
National Geographic Bee Ultimate Fact Book:Countries A to Z
The Chicago Manual of Style, 16th Edition
Merriam-Webster's Collegiate Dictionary, 11th Edition
Garner's Modern English Usage
Merriam-Webster's Guide to Punctuation and Style
The World Almanac and Book of Facts 2016
Indexing from A to Z, 2nd Edition
The Chicago Guide to Grammar, Usage, and Punctuation (Chicago Guides to Writing, Editing, and Publishing)