by $7.00
by $18.00
by Prof. Dr. Husaini Usman, M.Pd & R. Purnomo Setiady Akbar, S.Pd., M.Pd $11.00
by Adiwarman Karim $31.00
by Prof. Dr. S. Nasution, M.A. $7.00
by Saul M. Katz $6.00