Παραπομπή σε μορφή APA (7η εκδ.)

Fries, J. F., & Crapo, L. M. (1981). Vitality and aging: Implications of the rectangular curve. W. H. Freeman and Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Fries, James F., και Lawrence M. Crapo. Vitality and Aging: Implications of the Rectangular Curve. San Francisco: W. H. Freeman and Company, 1981.

Παραπομπή σε μορφή MLA (8th εκδ.)

Fries, James F., και Lawrence M. Crapo. Vitality and Aging: Implications of the Rectangular Curve. W. H. Freeman and Company, 1981.