Karma Tshering และ Taweesak Sawangrnek. (2014) The relationship between principal's instructional leadership and school effectiveness in the urban schools of bhutan. Naresuan University:ม.ป.ท.Karma Tshering และ Taweesak Sawangrnek. 2014. The relationship between principal's instructional leadership and school effectiveness in the urban schools of bhutan. ม.ป.ท.:Naresuan University;Karma Tshering และ Taweesak Sawangrnek. The relationship between principal's instructional leadership and school effectiveness in the urban schools of bhutan. ม.ป.ท.:Naresuan University, 2014. Print.