Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.