Cita APA (7th ed.)

Gabriel, R. H. (1929). The Lure of the frontiers (Idependence ed.). New Haven, Yale University Press.

Cita Chicago (17th ed.)

Gabriel, Ralph Henry. The Lure of the Frontiers. Idependence ed. Toronto: New Haven, Yale University Press, 1929.

Cita MLA (9th ed.)

Gabriel, Ralph Henry. The Lure of the Frontiers. Idependence ed. New Haven, Yale University Press, 1929.