Citazione APA

Knowlton, D. C. (1930). The Knowlton work-book in American history. Century Co.

Stile di citazione Chicago

Knowlton, Daniel C. The Knowlton Work-book in American History. New York, London: Century Co, 1930.

Citazione MLA

Knowlton, Daniel C. The Knowlton Work-book in American History. Century Co, 1930.