Schreurs, P. (2000). The location of Pigafetta's Mazaua, Butuan and Calagan, 1521-1571: A bibliographic and cartographic evidence. National Historical Institute.
Chicago-referens (17:e uppl.)Schreurs, Peter. The Location of Pigafetta's Mazaua, Butuan and Calagan, 1521-1571: A Bibliographic and Cartographic Evidence. Manila: National Historical Institute, 2000.
MLA-referens (9:e uppl.)Schreurs, Peter. The Location of Pigafetta's Mazaua, Butuan and Calagan, 1521-1571: A Bibliographic and Cartographic Evidence. National Historical Institute, 2000.
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