Handbook of professional ethics psychologist : isuues, questions, and controversies
edited by William O`Donohue and Kyle Ferguson
Sage, 2003
 Buku Teks
Ohls, Robin K.
Hematology, immunology and infectious disease : neonatology questions and controversies / Robin K. Ohls, Akhil Maheshwari
Elsevier Saunder, 2012
 Buku Teks
Nursing in gastroenterology
edited by Louise Bruce
Churchill Livingstone , 1997
 Buku Teks
Pitchumoni, C.S., editor
Geriatric gastroenterology
Springer, 2012
 eBooks
Marcellus Simadibrata
Current issues of gastroenterology in Indonesia
University of Indonesia. Faculty of Medicine, 2017
 Artikel Jurnal