Barnes RD (2004). “Introduction to Bilateria”. Invertebrate Zoology (7 ed.). Brooks / Cole. p. 197 [1]. ISBN 978-0-03-025982-1.
“gastrointestinal tract” at Dorland’s Medical Dictionary
Gastrointestinal+tract at the US National Library of Medicine Medical Subject Headings (MeSH)
“digestive system” at Dorland’s Medical Dictionary
G.
f Invertebrates”. www.ck12.org. 6 October 2015. Retrieved 25 June 2021.
Ruppert EE
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