Παραπομπή σε μορφή APA (7η εκδ.)

Sheff, A. L., & Ingalls, E. (1942). How to write letters for all occasions: Bussiness letters, social letters. The New Home Library.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sheff, Alexander L., και Edna Ingalls. How to Write Letters for All Occasions: Bussiness Letters, Social Letters. Philadelphia: The New Home Library, 1942.

Παραπομπή σε μορφή MLA (8th εκδ.)

Sheff, Alexander L., και Edna Ingalls. How to Write Letters for All Occasions: Bussiness Letters, Social Letters. The New Home Library, 1942.