Παραπομπή σε μορφή APA (7η εκδ.)

Kongreß of philosophy. (1973). Proceedings of the XVth [fifteenth] World Congress of Philosophy: 17th to 22nd september 1973, Varna (Bulgaria). Sofia Pr..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kongreß of philosophy. Proceedings of the XVth [fifteenth] World Congress of Philosophy: 17th to 22nd September 1973, Varna (Bulgaria). Sofia: Sofia Pr., 1973.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kongreß of philosophy. Proceedings of the XVth [fifteenth] World Congress of Philosophy: 17th to 22nd September 1973, Varna (Bulgaria). Sofia Pr., 1973.