Citace podle APA (7th ed.)

Butler, O. (1976). The Philippine islands: A commercial survey [microform]. Photoduplication Service, University of the Philippines Library.

Citace podle Chicago (17th ed.)

Butler, O.M. The Philippine Islands: A Commercial Survey [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.

Citace podle MLA (9th ed.)

Butler, O.M. The Philippine Islands: A Commercial Survey [microform]. Photoduplication Service, University of the Philippines Library, 1976.

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