APA (7th ed.) Citation

Shannon, C. W. (1913). The trees and shrubs of Oklahoma. [publisher not identified].

Chicago Style (17th ed.) Citation

Shannon, C. W. The Trees and Shrubs of Oklahoma. Norman: [publisher not identified], 1913.

MLA (9th ed.) Citation

Shannon, C. W. The Trees and Shrubs of Oklahoma. [publisher not identified], 1913.