Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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