Παραπομπή σε μορφή APA (7η εκδ.)

Betts, E. A., & Esterer, L. A. (1941). Directed spelling activities (Glossary ed.). American Book Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Betts, Emmett A., και Louise A. Esterer. Directed Spelling Activities. Glossary ed. [New York ; Cincinnati, etc.]: American Book Company, 1941.

Παραπομπή σε μορφή MLA (8th εκδ.)

Betts, Emmett A., και Louise A. Esterer. Directed Spelling Activities. Glossary ed. American Book Company, 1941.