Gaya APA

Kocka,Jurgen, . (1980). White Collar Workers in America 1890-1940: a Social Political History in International Perspective . California: SAGE publication.

Gaya MLA

Kocka,Jurgen, . "White Collar Workers in America 1890-1940: a Social Political History in International Perspective". California: SAGE publication, 1980. Text.