Popov, Kostadin
Cultural policy in Bulgaria
Unesco Press, 1981
 Buku Teks
Konstitusi Bulgaria
editor, S. Prajudi Atmosudirdjo ...[et al.]
Ghalia Indonesia, 1987
 Buku Teks
R. Vassilev
Sociology in Bulgaria
Publishing House of the Bulgaria, 1970
 Buku Teks SO
Yeh, Stephen H.K.
On the analysis of cultural and human resource development
UNESCO, 1990
 Buku Teks
Economic development and cultural change. Vol.19-21
The The University of Chicago
The University of Chicago Press, 1972
 Buku Teks