Ravenholt, A. (1968). Placido Urbanes, Jr: The making of a publisher. American Universities Field Staff.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRavenholt, Albert. Placido Urbanes, Jr: The Making of a Publisher. [New York]: American Universities Field Staff, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRavenholt, Albert. Placido Urbanes, Jr: The Making of a Publisher. American Universities Field Staff, 1968.
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