Dyfyniad APA

Maas, H. S., & Kuypers, J. A. (1974). From thirty to seventy. Jossey-Bass.

Dyfyniad Arddull Chicago

Maas, Henry S., and Joseph A. Kuypers. From Thirty to Seventy. San Francisco: Jossey-Bass, 1974.

Dyfyniad MLA

Maas, Henry S., and Joseph A. Kuypers. From Thirty to Seventy. Jossey-Bass, 1974.

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