Класни сукоб — разлика између измена

* {{Cite book |ref= harv|first = Milovan | last = Đilas | authorlink = Milovan Đilas | year = 1983, 1957 | title = The New Class: An Analysis of the Communist System | edition = paperback | publisher = Harcourt Brace Jovanovich | location = San Diego | isbn = 0-15-665489-X|ref=harv}}

* {{Cite book |ref= harv|last=Toynbee|first=Arnold|title=A Study of History: Abridgment of Volumes I - VI|year=1947|publisher=Oxford University Press|location=New York, NY|isbn=0-19-505081-9|editor=Dorothea Grace Somervell|page=365|chapter=The Nature of Disintegration|ref=harv}}