Ahmad, Y. J., El Serafy, S., & Lutz, E. (1989). Environmental Accounting for Sustainable Development: A UNEP-World Bank Symposium. The World Bank.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAhmad, Yusuf J., Salah El Serafy, और Ernst Lutz. Environmental Accounting for Sustainable Development: A UNEP-World Bank Symposium. Washington, D.C.: The World Bank, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAhmad, Yusuf J., et al. Environmental Accounting for Sustainable Development: A UNEP-World Bank Symposium. The World Bank, 1989.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.