International Labour Office & ebrary, Inc. (2011). Manual on the measurement of volunteer work. International Labour Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInternational Labour Office और Inc ebrary. Manual on the Measurement of Volunteer Work. Genève, Switzerland: International Labour Office, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रInternational Labour Office और Inc ebrary. Manual on the Measurement of Volunteer Work. International Labour Office, 2011.
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