Παραπομπή APA

Cushman, J. A. Monograph of the foraminiferal family valvulinidae.

Παραπομπή Chicago Style

Cushman, Joseph A. Monograph of the Foraminiferal Family Valvulinidae.

Παραπομπή MLA

Cushman, Joseph A. Monograph of the Foraminiferal Family Valvulinidae.