Παραπομπή σε μορφή APA (7η εκδ.)

Sapp, G. (1941). Happy helpers. Florida curriculum laboratory, College of education, University of Florida and State dept. of education.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sapp, Gertrude. Happy Helpers. Gainesville: Florida curriculum laboratory, College of education, University of Florida and State dept. of education, 1941.

Παραπομπή σε μορφή MLA (8th εκδ.)

Sapp, Gertrude. Happy Helpers. Florida curriculum laboratory, College of education, University of Florida and State dept. of education, 1941.