Citazione Stile APA (7a Edizione)

Curtis, W. E. (1903). Denmark, Norway and Sweden. Saalfield Pub.

Citazione stile Chigago Style (17a edizione)

Curtis, William Eleroy. Denmark, Norway and Sweden. New York: Saalfield Pub, 1903.

Citatione MLA (9a ed.)

Curtis, William Eleroy. Denmark, Norway and Sweden. Saalfield Pub, 1903.