APA (7th ed.) Citation

Popović, M. (1991). The fortress of Belgrade. Inst. for the Protection of Cultural Monuments.

Chicago Style (17th ed.) Citation

Popović, Marko. The Fortress of Belgrade. Belgrade: Inst. for the Protection of Cultural Monuments, 1991.

MLA (9th ed.) Citation

Popović, Marko. The Fortress of Belgrade. Inst. for the Protection of Cultural Monuments, 1991.

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