Παραπομπή σε μορφή APA (7η εκδ.)

Nierop, T. (1994). Systems and regions in global politics: An empirical study of diplomacy, international organization, and trade, 1950-1991. John Wiley.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Nierop, Tom. Systems and Regions in Global Politics: An Empirical Study of Diplomacy, International Organization, and Trade, 1950-1991. Chichester: John Wiley, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

Nierop, Tom. Systems and Regions in Global Politics: An Empirical Study of Diplomacy, International Organization, and Trade, 1950-1991. John Wiley, 1994.