Versteegh, Kees (1999). "Loanwords from Arabic and the merger of ḍ/ḏ̣". In Arazi, Albert; Sadan, Joseph; Wasserstein, David J. (eds.). Compilation and Creation in Adab and Luġa: Studies in Memory of Naphtali Kinberg (1948–1997). pp. 273–286. ISBN9781575060453.
Retsö, Jan (2012). "Classical Arabic". In Weninger, Stefan (ed.). The Semitic Languages: An International Handbook. Walter de Gruyter. pp. 785–786. ISBN978-3-11-025158-6.
Ferguson, Charles Albert (1997) [1959]. "The Arabic koine". In Belnap, R. Kirk; Haeri, Niloofar (eds.). Structuralist studies in Arabic linguistics: Charles A. Ferguson's papers, 1954–1994. Brill. pp. 67–68. ISBN9004105115.