Παραπομπή σε μορφή APA (7η εκδ.)

Langan, J. P., & Weigel, G. (1991). The American search for peace: Moral reasoning religious hope, and national security. Georgetown University.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Langan, John P., και George Weigel. The American Search for Peace: Moral Reasoning Religious Hope, and National Security. Washington: Georgetown University, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Langan, John P., και George Weigel. The American Search for Peace: Moral Reasoning Religious Hope, and National Security. Georgetown University, 1991.