Cita APA (7a ed.)

Nonev, B., Chakarova, M., & Alexiev, A. (1985). Bulgaria. Bulgaria Association of Tourism and Recreation.

Cita Chicago Style (17a ed.)

Nonev, Bogomil, María Chakarova, y Alexi Alexiev. Bulgaria. [S.l.]: Bulgaria Association of Tourism and Recreation, 1985.

Cita MLA (9a ed.)

Nonev, Bogomil, et al. Bulgaria. Bulgaria Association of Tourism and Recreation, 1985.