Yangas, R. G., & Unson, D. (1970). The social soundness of improving the water supply system in five provincial cities. Institute of Philippine Culture, Ateneo de Manila University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रYangas, Rosalinda Garcia, और Delia Unson. The Social Soundness of Improving the Water Supply System in Five Provincial Cities. Quezon City: Institute of Philippine Culture, Ateneo de Manila University, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रYangas, Rosalinda Garcia, और Delia Unson. The Social Soundness of Improving the Water Supply System in Five Provincial Cities. Institute of Philippine Culture, Ateneo de Manila University, 1970.
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