Hee-Young, Lee
Gramedia, 2020
Buku Teks SO
A Ward Lock Book, 1997
Buku Referensi
Sulaiman Yusuf
Indonesian Journal of Gastroenterology Hepatology and Digestive Endoscopy, 2006
Artikel Jurnal
Kay, David C.
IDG Books, 2001
Buku Teks SO
Dina A. Heryanto
Elex Media Komputindo, 1988
Buku Teks SO