Não informado. (1953). Improving College and University Teaching. Heldref Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Improving College and University Teaching. Washington: Heldref Publications, 1953.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Improving College and University Teaching. Heldref Publications, 1953.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.