Haan, H., & Celestin, J. (1989). Urban formal sector information: Needs and methods. International Labour Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHaan, Hans, और J.B Celestin. Urban Formal Sector Information: Needs and Methods. Geneva: International Labour Office, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHaan, Hans, और J.B Celestin. Urban Formal Sector Information: Needs and Methods. International Labour Office, 1989.
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