Bernardo, C. R. (1974). The analysis of petrolatum-based essential oil preparations by gas chromatography and its application to quality control [microform]. Photoduplication Service, University of the Philippines Library.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিBernardo, Crispin R. The Analysis of Petrolatum-based Essential Oil Preparations by Gas Chromatography and Its Application to Quality Control [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1974.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিBernardo, Crispin R. The Analysis of Petrolatum-based Essential Oil Preparations by Gas Chromatography and Its Application to Quality Control [microform]. Photoduplication Service, University of the Philippines Library, 1974.
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