University of the Philippines (Diliman). Institute for Science and Mathematics Education Development & Ulep, S. A. (1985). Conserving electrical energy in commerce and industry. The Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUniversity of the Philippines (Diliman). Institute for Science and Mathematics Education Development और Soledad A. Ulep. Conserving Electrical Energy in Commerce and Industry. Quezon City: The Institute, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUniversity of the Philippines (Diliman). Institute for Science and Mathematics Education Development और Soledad A. Ulep. Conserving Electrical Energy in Commerce and Industry. The Institute, 1985.
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