Bigornia, M. L., & Ortega, G. (1983). Ang kalakalang Galeon: Mulang Maynila hanggang Acapulco (Second edition.). Children's Communication Center.
Citace podle Chicago (17th ed.)Bigornia, Mike L., a Gualberto Ortega. Ang Kalakalang Galeon: Mulang Maynila Hanggang Acapulco. Second edition. Quezon City: Children's Communication Center, 1983.
Citace podle MLA (9th ed.)Bigornia, Mike L., a Gualberto Ortega. Ang Kalakalang Galeon: Mulang Maynila Hanggang Acapulco. Second edition. Children's Communication Center, 1983.
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