APA

Hoptner J. B., . (1963). Yugoslavia in crisis, 1934-1941. New York: Columbia University Press.

Chicago

Hoptner Jacob B, . 1963. Yugoslavia in crisis, 1934-1941. New York: Columbia University Press.

Harvard

Hoptner J. B., . (1963). Yugoslavia in crisis, 1934-1941. New York: Columbia University Press.

MLA

Hoptner Jacob B, . Yugoslavia in crisis, 1934-1941. New York: Columbia University Press. 1963.