Παραπομπή σε μορφή APA (7η εκδ.)

Williams, M. J., & Petesch, P. L. (1993). Sustaining the earth: Role of multilateral development institutions. Overseas development Council.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Williams, Maurice J., και Patti L. Petesch. Sustaining the Earth: Role of Multilateral Development Institutions. Washington, D.C.: Overseas development Council, 1993.

Παραπομπή σε μορφή MLA (9th εκδ.)

Williams, Maurice J., και Patti L. Petesch. Sustaining the Earth: Role of Multilateral Development Institutions. Overseas development Council, 1993.