Gaya APA

Barker,Randol, ., al, B, E. (1991). Principles of Ambulatory Medicine (3 ed th). Baltimore: Williams \r Wilkins.

Gaya MLA

Barker,Randol, ., al, Burton,John, Et. "Principles of Ambulatory Medicine". 3 ed th Baltimore: Williams \r Wilkins, 1991. print.