Spooner, Brian (1994). „Dari, Farsi, and Tojiki”. Ур.: Marashi, Mehdi. Persian Studies in North America: Studies in Honor of Mohammad Ali Jazayery. Leiden: Brill. стр. 177—178. ISBN9780936347356.
Spooner, Brian (2012). „Dari, Farsi, and Tojiki”. Ур.: Schiffman, Harold. Language policy and language conflict in Afghanistan and its neighbors: the changing politics of language choice. Leiden: Brill. стр. 94. ISBN978-9004201453.
Campbell, George L.; King, Gareth, ур. (2013). „Persian”. Compendium of the World's Languages (3rd изд.). Routledge. стр. 1339. ISBN9781136258466.