APA

Buljova P. V., Levkova N. G. & Rankova M. A. (1976). English by television. Sofia: Nauka i iskustwo.

Chicago

Buljova Paraskeva Vladimirova, Levkova Nina Georgieva and Rankova Marija Atanasova. 1976. English by television. Sofia: Nauka i iskustwo.

Harvard

Buljova P. V., Levkova N. G. and Rankova M. A. (1976). English by television. Sofia: Nauka i iskustwo.

MLA

Buljova Paraskeva Vladimirova, Levkova Nina Georgieva and Rankova Marija Atanasova. English by television. Sofia: Nauka i iskustwo. 1976.