Gaya APA

Ph.D., W, B. (1973). Textbook of Michrobiology (Ed. 20). U.S.A: W. B. Saundres Company.

Gaya MLA

Ph.D., William, Burrows,. "Textbook of Michrobiology". Ed. 20 U.S.A: W. B. Saundres Company, 1973. Text.