Παραπομπή σε μορφή APA (7η εκδ.)

Heck, G. W. (2007). When worlds collide: Exploring the ideological and political foundations of the clash of civilization. Rowman & Littlefield.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Heck, Gene W. When Worlds Collide: Exploring the Ideological and Political Foundations of the Clash of Civilization. Lanham: Rowman & Littlefield, 2007.

Παραπομπή σε μορφή MLA (9th εκδ.)

Heck, Gene W. When Worlds Collide: Exploring the Ideological and Political Foundations of the Clash of Civilization. Rowman & Littlefield, 2007.