APA

Valentine J. W., . (1993). Leadership in middle level education: volume I : a national survey of middle level leaders and schools. Reston, VA: National Association of Secondary School Principals.

Chicago

Valentine Jerry W, . 1993. Leadership in middle level education: volume I : a national survey of middle level leaders and schools. Reston, VA: National Association of Secondary School Principals.

Harvard

Valentine J. W., . (1993). Leadership in middle level education: volume I : a national survey of middle level leaders and schools. Reston, VA: National Association of Secondary School Principals.

MLA

Valentine Jerry W, . Leadership in middle level education: volume I : a national survey of middle level leaders and schools. Reston, VA: National Association of Secondary School Principals. 1993.