(1941). Free and Inexpensive Learning Materials. Nashville, Tennessee: George Peabody College for Teachers.
शिकागो स्टाइल उद्धरणFree and Inexpensive Learning Materials. Nashville, Tennessee: George Peabody College for Teachers, 1941.
एमएलए उद्धरणFree and Inexpensive Learning Materials. Nashville, Tennessee: George Peabody College for Teachers, 1941.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.