The Island Garden City of Samal is part of Davao del Norte, not Davao del Sur.
Samal language
editEnglish-Samal vocabulary [microform] (1921)
https://archive.org/details/aqn6353.0001.001.umich.edu
Author: Bartter, Frances E; American Philosophical Society. Library Subject: Sama Sibutu language; English language Publisher: Zamboangangan : The Sulu Press Language: Austronesian Digitizing sponsor: University of Michigan Book contributor: University of Michigan Collection: michigan_books; americana
http://language.psy.auckland.ac.nz/austronesian/language.php?id=443
Language: Samal, Siasi Dialect
Sources on Samal
edithttp://www.encyclopedia.com/doc/1G2-3458000879.html
http://www.everyculture.com/East-Southeast-Asia/Samal-Orientation.html
http://www.sil.org/resources/publications/entry/7919
A View from the Islands: The Samal of Tawi-Tawi Author(s): Allison, Karen J Series: Publications in Ethnography Date: 1984 ISBN 13: 978-0883121689 ISBN 10:0883121689