Παραπομπή APA

Cushman, J. A. (1969). Foraminifera: Their classification and economic use (4.).

Παραπομπή Chicago Style

Cushman, Joseph A. Foraminifera: Their Classification and Economic Use. 4. Harvard University Press, Cambridge, 1969.

Παραπομπή MLA

Cushman, Joseph A. Foraminifera: Their Classification and Economic Use. 4. 1969.