Open University, Johnson, J., & Slater, R. (1993). Ageing and later life. Sage Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOpen University, Julia Johnson, और Robert Slater. Ageing and Later Life. London ; Thousand Oaks, Calif.: Sage Publications, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOpen University, et al. Ageing and Later Life. Sage Publications, 1993.
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