Clark, R. L., & Anker, R. (1990). Labour force participation rates of older persons: An international comparison. International Labour Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClark, Robert L., और Richard Anker. Labour Force Participation Rates of Older Persons: An International Comparison. Geneva: International Labour Office, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClark, Robert L., और Richard Anker. Labour Force Participation Rates of Older Persons: An International Comparison. International Labour Office, 1990.
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