APA (7th ed.) Citation

Dobrev, P. (1995). Universum Protobulgaricum. Orion-Commerse.

Chicago Style (17th ed.) Citation

Dobrev, Petăr. Universum Protobulgaricum. Sofia: Orion-Commerse, 1995.

MLA (9th ed.) Citation

Dobrev, Petăr. Universum Protobulgaricum. Orion-Commerse, 1995.

Warning: These citations may not always be 100% accurate.