by Prof. Dr. H. Abuddin Nata, M.A
$11.00

by Prof. Dr. S. Nasution, M.A.
$6.00

by Fausiah, Fitri, & Julianti Widury
$7.00

by Dr. Hamzah B. Uno, M.Pd
$0.00

by Loyniwati Kho
$6.00

by Prof. Dr. H. Muhaimin, M.A
$11.00