APA

Buljova P. V., Levkova N. G. & Rankova M. A. (1975). English by television. Sofia: Naouka i izkoustvo.

Chicago

Buljova Paraskeva Vladimirova, Levkova Nina Georgieva and Rankova Marija Atanasova. 1975. English by television. Sofia: Naouka i izkoustvo.

Harvard

Buljova P. V., Levkova N. G. and Rankova M. A. (1975). English by television. Sofia: Naouka i izkoustvo.

MLA

Buljova Paraskeva Vladimirova, Levkova Nina Georgieva and Rankova Marija Atanasova. English by television. Sofia: Naouka i izkoustvo. 1975.