Não informado. (1953). Improving College and University Teaching. Heldref Publications.
Chicago-referens (17:e uppl.)Não informado. Improving College and University Teaching. Washington: Heldref Publications, 1953.
MLA-referens (8:e uppl.)Não informado. Improving College and University Teaching. Heldref Publications, 1953.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.