Cita APA (7a ed.)

(1939). Vol. 34, № 5-8; Economic Geology. 1939.

Cita Chicago Style (17a ed.)

Vol. 34, № 5-8; Economic Geology. 1939, 1939.

Cita MLA (9a ed.)

Vol. 34, № 5-8; Economic Geology. 1939, 1939.