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^Celedonio G. Aguilar (1994). Readings in Philippine Literature. Quezon City: Rex Bookstore. p. 179. ISBN971-23-1564-9.
^Michael Barr; Rachel Bean; Mark T. Berger; Chang Chiou Yi; Terence Chong; Christopher Dent; Lawrence Douglas; Michelle Felton; Luisa Igloria; Chris McNab; James Martin; Emmanuel K. Mbobi; Terry E. Miller; Jürgen Neuberg; Ian Proudfoot; Mina Roces; Katen Romano-Young; Henry Russell; Andrew J. Wood (2007). World and Its Peoples: Malaysia, Philippines, Singapore, and Brunei. Tarrytown, New York: Marshall Cavendish. p. 1250. ISBN0-7614-7642-3.