APA

Zivkov T. H., . (1981). Report of the Central Committee of the Bulgarian Communist Party to the Twelfth Congress and the forthcoming tasks of the Party March 31, 1981 ; Speech at the Closing of the Twelfth Congress of the Bulgarian Communist Party April 4, 1981. Sofia: Sofia-Presse.

Chicago

Zivkov Todor Hristov, . 1981. Report of the Central Committee of the Bulgarian Communist Party to the Twelfth Congress and the forthcoming tasks of the Party March 31, 1981 ; Speech at the Closing of the Twelfth Congress of the Bulgarian Communist Party April 4, 1981. Sofia: Sofia-Presse.

Harvard

Zivkov T. H., . (1981). Report of the Central Committee of the Bulgarian Communist Party to the Twelfth Congress and the forthcoming tasks of the Party March 31, 1981 ; Speech at the Closing of the Twelfth Congress of the Bulgarian Communist Party April 4, 1981. Sofia: Sofia-Presse.

MLA

Zivkov Todor Hristov, . Report of the Central Committee of the Bulgarian Communist Party to the Twelfth Congress and the forthcoming tasks of the Party March 31, 1981 ; Speech at the Closing of the Twelfth Congress of the Bulgarian Communist Party April 4, 1981. Sofia: Sofia-Presse. 1981.