Wilson, R. H. (1978). 25th Anniversary: Institutional Services Incorporated, Archdiocese of Philadelphia. S.l..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilson, Robert H. 25th Anniversary: Institutional Services Incorporated, Archdiocese of Philadelphia. S.l., 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilson, Robert H. 25th Anniversary: Institutional Services Incorporated, Archdiocese of Philadelphia. S.l., 1978.
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