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ebrary, Inc, J. Christoph Bürgel, and C. van Ruymbeke. A Key to the Treasure of the Hakīm: Artistic and Humanistic Aspects of Nizāmī Ganjavī's Khamsa. Leiden: Leiden University Press, 2011.

ebrary, Inc, et al. A Key to the Treasure of the Hakīm: Artistic and Humanistic Aspects of Nizāmī Ganjavī's Khamsa. Leiden University Press, 2011.