APA (7th ed.) Citation

Parsons, A. B. (1933). The porphyry coppers. [publisher not identified].

Chicago Style (17th ed.) Citation

Parsons, A. B. The Porphyry Coppers. New York: [publisher not identified], 1933.

MLA (9th ed.) Citation

Parsons, A. B. The Porphyry Coppers. [publisher not identified], 1933.