Tactay, P. B. (1970). Potential economic survey of La Union with focus on cottage industries and tourism: Fieldwork report. Institute for Small-Scale Industries, University of the Philippines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTactay, Perfecta B. Potential Economic Survey of La Union with Focus on Cottage Industries and Tourism: Fieldwork Report. Quezon City: Institute for Small-Scale Industries, University of the Philippines, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTactay, Perfecta B. Potential Economic Survey of La Union with Focus on Cottage Industries and Tourism: Fieldwork Report. Institute for Small-Scale Industries, University of the Philippines, 1970.
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