APA (7th ed.) Citation

Clemons, R. E. (1966). Geology of the Chiquimula Quadrangle, Guatemala, Central America. [publisher not identified].

Chicago Style (17th ed.) Citation

Clemons, Russell Edward. Geology of the Chiquimula Quadrangle, Guatemala, Central America. Austin, Tex.: [publisher not identified], 1966.

MLA (9th ed.) Citation

Clemons, Russell Edward. Geology of the Chiquimula Quadrangle, Guatemala, Central America. [publisher not identified], 1966.