Abad, G. R. I., Cerrero, G. T., Ty, L. B. E., & Villanueva, F. C. (1999). A Feasibility study on HerbyGel: An Anti-Toothache Herbal Toothpaste. College of Engineering.
Chicago-viite (17. p.)Abad, George R. II, Geraldine T. Cerrero, Laura Blossom E. Ty, ja Farah C. Villanueva. A Feasibility Study on HerbyGel: An Anti-Toothache Herbal Toothpaste. Diliman, Quezon City: College of Engineering, 1999.
MLA-viite (9. p.)Abad, George R. II, et al. A Feasibility Study on HerbyGel: An Anti-Toothache Herbal Toothpaste. College of Engineering, 1999.
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