Bull, P., & Foxen, E. M. (1985). Lecture notes on diseases of the ear, nose and throat (6th ed.). Blackwell Scientific Pub.
Lua i Stíl Chicago (17ú heag.)Bull, P.D, agus E.H. Miles Foxen. Lecture Notes on Diseases of the Ear, Nose and Throat. 6th ed. Oxford: Blackwell Scientific Pub, 1985.
Lua MLA (9ú heag.)Bull, P.D, agus E.H. Miles Foxen. Lecture Notes on Diseases of the Ear, Nose and Throat. 6th ed. Blackwell Scientific Pub, 1985.
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