Cita APA

Willoughby, W. R., & Willoughby, W. R. (1961). The St. Lawrence waterway: A study in politics and diplomacy. Madison: University of Wisconsin Press.

Citación estilo Chicago

Willoughby, William R., y William R. Willoughby. The St. Lawrence Waterway: A Study in Politics and Diplomacy. Madison: University of Wisconsin Press, 1961.

Cita MLA

Willoughby, William R., y William R. Willoughby. The St. Lawrence Waterway: A Study in Politics and Diplomacy. Madison: University of Wisconsin Press, 1961.