TY - JOUR AU - , AU - , AU - , Mohammad AU - , TI - A Study of Humanities Textbooks within the Framework of Halliday's Systemic Functional Grammar from the Viewpoint of Interpersonal Metafunction JO - Pazhūhish-i Źabān va Adabiyyāt-i Farsī VL - 8 IS - 17 SP - 1 EP - 10 PY - 2010 DO - ER -