APA

Wrigley E., . (1969). Population and history. New York: McGraw-Hill.

Chicago

Wrigley E.A, . 1969. Population and history. New York: McGraw-Hill.

Harvard

Wrigley E., . (1969). Population and history. New York: McGraw-Hill.

MLA

Wrigley E.A, . Population and history. New York: McGraw-Hill. 1969.