Hontiveros, G. (2004). Butuan of a thousand years. Butuan City Historical and Cultural Foundation.
Citace podle Chicago (17th ed.)Hontiveros, Greg. Butuan of a Thousand Years. Butuan City: Butuan City Historical and Cultural Foundation, 2004.
Citace podle MLA (9th ed.)Hontiveros, Greg. Butuan of a Thousand Years. Butuan City Historical and Cultural Foundation, 2004.
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