De los Reyes, R. A. (1993). Speak with butterflies: A unique public speaking guidebook. PROSEC (Professional Skills Enrichment Center).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDe los Reyes, Rodolfo A. Speak with Butterflies: A Unique Public Speaking Guidebook. Makati: PROSEC (Professional Skills Enrichment Center), 1993.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDe los Reyes, Rodolfo A. Speak with Butterflies: A Unique Public Speaking Guidebook. PROSEC (Professional Skills Enrichment Center), 1993.
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