Hayes, E. N., & Sargent, P. Directory for exceptional children: Schools, services, other facilities ([1st ed., 1954-.). P. Sargent.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHayes, Eugene Nelson, और Porter Sargent. Directory for Exceptional Children: Schools, Services, Other Facilities. [1st ed., 1954-. Boston: P. Sargent.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHayes, Eugene Nelson, और Porter Sargent. Directory for Exceptional Children: Schools, Services, Other Facilities. [1st ed., 1954-. P. Sargent.
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