Sapp, G. (1941). Happy helpers. Florida curriculum laboratory, College of education, University of Florida and State dept. of education.
Chicago-Zitierstil (17. Ausg.)Sapp, Gertrude. Happy Helpers. Gainesville: Florida curriculum laboratory, College of education, University of Florida and State dept. of education, 1941.
MLA-Zitierstil (8. Ausg.)Sapp, Gertrude. Happy Helpers. Florida curriculum laboratory, College of education, University of Florida and State dept. of education, 1941.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.