Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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