APA (7th ed.) Citation

Hatmaker, P. (1932). Pumice and pumicite. [publisher not identified].

Chicago Style (17th ed.) Citation

Hatmaker, Paul. Pumice and Pumicite. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Hatmaker, Paul. Pumice and Pumicite. [publisher not identified], 1932.