Não informado. (1955). Educators guide to free tapes, scripts and transcriptions. Educators Progress Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educators Guide to Free Tapes, Scripts and Transcriptions. Randolph, Wis: Educators Progress Service, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educators Guide to Free Tapes, Scripts and Transcriptions. Educators Progress Service, 1955.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.