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RenatoR.PerdonRenatoR. (red.), Pocket Tagalog dictionary, Hong Kong: Periplus Editions, 2005, ISBN 978-0-7946-0345-8, OCLC61252120(ang.). Brak numerów stron w książce
Picus SizhiP.S.DingPicus SizhiP.S., Tone languages, [w:] PhilippP.Strazny (red.), Encyclopedia of Linguistics, t. 2: M–Z, New York: Fitzroy Dearborn, 2005, s. 1117–1120, DOI: 10.4324/9780203319208, ISBN 978-1-57958-451-1, OCLC55679645(ang.).