by Iwan Yusi, S.Pd $7.00
by Dr. Purnawan Junadi, Ph.D $7.00
by - $9.00
by Dr. W. Herdin Sibuea., dkk $7.00
by Dra. Rostamailis $9.00
by Ikhsan Rosyada Parluhutan Daulay, S.H $11.00