APA

Willcox W. F., . (19711940). Studies in American demography. New York: Russell & Russell.

Chicago

Willcox Walter Francis, . 19711940. Studies in American demography. New York: Russell & Russell.

Harvard

Willcox W. F., . (19711940). Studies in American demography. New York: Russell & Russell.

MLA

Willcox Walter Francis, . Studies in American demography. New York: Russell & Russell. 19711940.