Παραπομπή σε μορφή APA (7η εκδ.)

(1975). Country market: People's Republic of Bulgaria. Trade Information and Publications Section, Export Services Coordinating Division, Bureau of Foreign Trade, Dept. of Trade.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Country Market: People's Republic of Bulgaria. Quezon City: Trade Information and Publications Section, Export Services Coordinating Division, Bureau of Foreign Trade, Dept. of Trade, 1975.

Παραπομπή σε μορφή MLA (9th εκδ.)

Country Market: People's Republic of Bulgaria. Trade Information and Publications Section, Export Services Coordinating Division, Bureau of Foreign Trade, Dept. of Trade, 1975.