APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Wellens, K., Rieter, E. R., & Waele, H. C. F. J. A. d. (2012). Evolving principles of international law: Studies in honour of Karel C. Wellens. Martinus Nijhoff Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Karel Wellens, E. R. Rieter, और Henri Clemens Ferdinand Jozef Alexander de Waele. Evolving Principles of International Law: Studies in Honour of Karel C. Wellens. Boston: Martinus Nijhoff Publishers, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, et al. Evolving Principles of International Law: Studies in Honour of Karel C. Wellens. Martinus Nijhoff Publishers, 2012.
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