Porter, J., & Lacey, P. (2005). Researching learning difficulties: A guide for practitioners. Paul Chapman Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPorter, Jill, और Penny Lacey. Researching Learning Difficulties: A Guide for Practitioners. London ; Thousand Oaks, California: Paul Chapman Publishing, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPorter, Jill, और Penny Lacey. Researching Learning Difficulties: A Guide for Practitioners. Paul Chapman Publishing, 2005.
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