«University of Cambridge». ص. Today the language is spoken in two main mutually intelligible varieties: Western Persian, or Farsi, mainly spoken in Iran, and Eastern Persian, or Dari, spoken in Afghanistan and Pakistan٫ The formal standard language is based on the dialect of Teheran٫ It is written in a form of the Arabic script called Perso-Arabic٫.
iranicaonline.org
"Encyclopaedia Iranica" (به انگلیسی). p. Arabo-Persian script. The Arabic script is used to write Chorasmian, Persian, and other modern languages. Pash-to, written in the Persian variant of the Arabo-Persian script, and Baluchi, written in the Pakistani variant, both employ additional diacritics for the retroflex consonants; Pashto also uses diacritics to distinguish phonemes not found in Persian.
«Encyclopaedia Iranica» (به انگلیسی). ص. The historical context in which Persian written in Arabic script, as a literary and official language, evolved from the ۹th century onwards has been described variously as one of an “Iranian renaissance,” “national rebirth,” etc٫٫٫٫.
