APA

Friis H. R., . (1940). A series of population maps of the colonies and the united states 1925-1790. New York-US: Geografical record.

Chicago

Friis Herman R, . 1940. A series of population maps of the colonies and the united states 1925-1790. New York-US: Geografical record.

Harvard

Friis H. R., . (1940). A series of population maps of the colonies and the united states 1925-1790. New York-US: Geografical record.

MLA

Friis Herman R, . A series of population maps of the colonies and the united states 1925-1790. New York-US: Geografical record. 1940.