Cita APA (7a ed.)

Congreso Mundial de Filosofía. (1973). Proceedings of the XVth World Congress of Philosophy: 17th to 22nd September 1973, Varna (Bulgaria). Sofia Press Production Centre.

Cita Chicago Style (17a ed.)

Congreso Mundial de Filosofía. Proceedings of the XVth World Congress of Philosophy: 17th to 22nd September 1973, Varna (Bulgaria). Sofia: Sofia Press Production Centre, 1973.

Cita MLA (9a ed.)

Congreso Mundial de Filosofía. Proceedings of the XVth World Congress of Philosophy: 17th to 22nd September 1973, Varna (Bulgaria). Sofia Press Production Centre, 1973.