//-->
Country report Non-discrimination : Bulgaria 2015 ; Including summaries in English, French and German
Ilieva, Margarita, (2015)
Ikonomičeski problemi na nematerialnoto proizvodstvo
Vakrilov, Janko G., (1984)
Formi i upravlenie na dobrovolnija dopălnitelen trud
Šopov, Dimităr A., (1985)