Gaya APA

walker, W, A., Sherman, W, C, , K. (2008). Pediatric Gastrointestinal Disease Vol.1 & 2 (FOURTH EDITION). : .

Gaya MLA

walker, W., Allan., Sherman, Walker, Coulet, , Kleinman. "Pediatric Gastrointestinal Disease Vol.1 & 2". FOURTH EDITION : , 2008. Text.