APA

Willigan W. L., O'Connor J. J., . (1940). Sociology: by Walter Luke Willigan and John J. O'Connor. New York, London: Longmans, Green and Co.

Chicago

Willigan Walter Luke, O'Connor John Joseph, . 1940. Sociology: by Walter Luke Willigan and John J. O'Connor. New York, London: Longmans, Green and Co.

Harvard

Willigan W. L., O'Connor J. J., . (1940). Sociology: by Walter Luke Willigan and John J. O'Connor. New York, London: Longmans, Green and Co.

MLA

Willigan Walter Luke, O'Connor John Joseph, . Sociology: by Walter Luke Willigan and John J. O'Connor. New York, London: Longmans, Green and Co. 1940.