APA (7 ম সংস্করণ) উদ্ধৃতি

Billett, R. O. (1940). Fundamental of secondary-school teaching: With emphasis on the unit method. Houghthon Mifflin Company.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Billett, Roy O. Fundamental of Secondary-school Teaching: With Emphasis on the Unit Method. Houghthon Mifflin Company, 1940.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Billett, Roy O. Fundamental of Secondary-school Teaching: With Emphasis on the Unit Method. Houghthon Mifflin Company, 1940.