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Toumanoff & Chaumont 1987, pp. 169–170. - Toumanoff, C.; Chaumont, M. L. (1987). "Āzād (Iranian Nobility)". In Yarshater, Ehsan (ed.). Encyclopædia Iranica. Vol. III/2: Awāʾel al-maqālāt–Azerbaijan IV. London and New York: Routledge & Kegan Paul. pp. 169–170. ISBN 978-0-71009-114-7. https://www.iranicaonline.org/articles/azad-older-azat
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Toumanoff & Chaumont 1987, pp. 169–170. - Toumanoff, C.; Chaumont, M. L. (1987). "Āzād (Iranian Nobility)". In Yarshater, Ehsan (ed.). Encyclopædia Iranica. Vol. III/2: Awāʾel al-maqālāt–Azerbaijan IV. London and New York: Routledge & Kegan Paul. pp. 169–170. ISBN 978-0-71009-114-7. https://www.iranicaonline.org/articles/azad-older-azat