Philippine National Science Society. (1989). Proceedings of the 55th emerald year anniversity celebration. Philippine National Science Society.
Chicago-viite (17. p.)Philippine National Science Society. Proceedings of the 55th Emerald Year Anniversity Celebration. Taguig, Metro Manila: Philippine National Science Society, 1989.
MLA-viite (9. p.)Philippine National Science Society. Proceedings of the 55th Emerald Year Anniversity Celebration. Philippine National Science Society, 1989.
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