Laureles , F. B. I., Mangalinao, A. V., Valenzuela, R. I. O., & Sundiang, C. (2001). Aral kalikasan: Mount Purro Environmental Educational Camp.
Čikaški stil citiranja (17. izdanje)Laureles , Fred Benedick III, Ariel V. Mangalinao, Rolando III O. Valenzuela, i Cynthia Sundiang. Aral Kalikasan: Mount Purro Environmental Educational Camp. 2001.
MLA način citiranja (9. izdanje)Laureles , Fred Benedick III, et al. Aral Kalikasan: Mount Purro Environmental Educational Camp. 2001.
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