by Philip Etienne R. $3.00
by Muh. Hanif Anwari $7.00
by Calvin S. Hall & Gradner Lindzey $12.00
by $3.00
by Dr. Ir. Muhammad Rasyaf, MS $6.00
by Agus Sunaryo, SH., MBA $16.00
by E. Martasudjita, Pr. $4.00