APA

Leff G., . (1969). History and social theory. University, Ala: University of Alabama Press.

Chicago

Leff Gordon, . 1969. History and social theory. University, Ala: University of Alabama Press.

Harvard

Leff G., . (1969). History and social theory. University, Ala: University of Alabama Press.

MLA

Leff Gordon, . History and social theory. University, Ala: University of Alabama Press. 1969.