Παραπομπή APA

Cushman, J. A. (1939). Monograph of the foraminiferal family nonionidae. Geological survey.

Παραπομπή Chicago Style

Cushman, Joseph A. Monograph of the Foraminiferal Family Nonionidae. Washinton: Geological survey, 1939.

Παραπομπή MLA

Cushman, Joseph A. Monograph of the Foraminiferal Family Nonionidae. Geological survey, 1939.