7 1 20 Prof. Drs. S. Wojowasito Primary Author mixed material John M. Echols Primary Author Hassan Shadily Primary Author mixed material 9789796864522 John M. Echols Primary Author Hassan Shadily Primary Author mixed material 9794037532 Primary Author Drs. Artono Wardiman Primary Author mixed material Sri Utari Subiyakto N. Primary Author Basri Syamsu Primary Author mixed material Primary Author Wiliting Primary Author mixed material mixed material 9794486655