Tohutoro APA (7th ed.)
Maas, H. S., & Kuypers, J. A. (1974). From thirty to seventy. Jossey-Bass.
Tohutoru Kātū Chicago (17th ed.)
Maas, Henry S., me Joseph A. Kuypers. From Thirty to Seventy. San Francisco: Jossey-Bass, 1974.
Tohutoro MLA (9th ed.)
Maas, Henry S., me Joseph A. Kuypers. From Thirty to Seventy. Jossey-Bass, 1974.
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