Billett, R. O. (1940). Fundamental of secondary-school teaching: With emphasis on the unit method. Houghthon Mifflin Company.
Citace podle Chicago (17th ed.)Billett, Roy O. Fundamental of Secondary-school Teaching: With Emphasis on the Unit Method. Houghthon Mifflin Company, 1940.
Citace podle MLA (8th ed.)Billett, Roy O. Fundamental of Secondary-school Teaching: With Emphasis on the Unit Method. Houghthon Mifflin Company, 1940.
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