Campos, P. C., & Velasco, J. R. (1970). Proceedings of the Philippine Association for the Advancement of Science, 1970. Philippine Association for the Advancement of Science.
Chicago-referens (17:e uppl.)Campos, Paulo C., och Jose R. Velasco. Proceedings of the Philippine Association for the Advancement of Science, 1970. Manila: Philippine Association for the Advancement of Science, 1970.
MLA-referens (9:e uppl.)Campos, Paulo C., och Jose R. Velasco. Proceedings of the Philippine Association for the Advancement of Science, 1970. Philippine Association for the Advancement of Science, 1970.
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