Παραπομπή σε μορφή APA (7η εκδ.)

Freeland, G. E. (1939). Learning activities with self-testing exercises for America and the new frontier. C. Scribner's Sons.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Freeland, George Earl. Learning Activities with Self-testing Exercises for America and the New Frontier. New York: C. Scribner's Sons, 1939.

Παραπομπή σε μορφή MLA (8th εκδ.)

Freeland, George Earl. Learning Activities with Self-testing Exercises for America and the New Frontier. C. Scribner's Sons, 1939.