Manalac, S., Senador, A., & Escoto, A. D. Sulfonation of clean and contaminated polystyrene (Styrofoam). Philippine Engineering Journal.
Čikaški stil citiranja (17. izdanje)Manalac, S., A. Senador, i Angela D. Escoto. "Sulfonation of Clean and Contaminated Polystyrene (Styrofoam)." Philippine Engineering Journal .
MLA način citiranja (9. izdanje)Manalac, S., et al. "Sulfonation of Clean and Contaminated Polystyrene (Styrofoam)." Philippine Engineering Journal, .
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