* Perry, J. R. (2005) "A Tajik Persian Reference Grammar" (Boston : Brill) p. 34*2002: Siddikzoda, S. "Tajik Language: Farsi or not Farsi?
# Perry, J. R. (2005) "A Tajik Persian Reference Grammar" (Boston : Brill) p. 34# Siddikzoda, S. "Tajik Language: Farsi or not Farsi?