APA-referens (7:e uppl.)

KRUG, M. M. (1967). History and the social science. Blaisdell Pub.

Chicago-referens (17:e uppl.)

KRUG, Mark M. History and the Social Science. Toronto: Blaisdell Pub, 1967.

MLA-referens (9:e uppl.)

KRUG, Mark M. History and the Social Science. Blaisdell Pub, 1967.