Porter, J., & Lacey, P. (2005). Researching learning difficulties: A guide for practitioners. P.C.P. ; SAGE Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPorter, Jill, और Penny Lacey. Researching Learning Difficulties: A Guide for Practitioners. London : Thousand Oaks, CA: P.C.P. ; SAGE Publications, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPorter, Jill, और Penny Lacey. Researching Learning Difficulties: A Guide for Practitioners. P.C.P. ; SAGE Publications, 2005.
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