APA (7th ed.) Citation

Nixon, E. S., & Cunningham, B. L. (2010). Gymnosperms of the United States & Canada. Bruce Lyndon Cunningham Productions.

Chicago Style (17th ed.) Citation

Nixon, Elray S., and Bruce Lyndon Cunningham. Gymnosperms of the United States & Canada. Nacogdoches, Tex.: Bruce Lyndon Cunningham Productions, 2010.

MLA (8th ed.) Citation

Nixon, Elray S., and Bruce Lyndon Cunningham. Gymnosperms of the United States & Canada. Bruce Lyndon Cunningham Productions, 2010.

Warning: These citations may not always be 100% accurate.