by Dr. Ahmad Jayadi, M.Pd $7.00
by Barbara L. Viera $9.00
by Adiwarman Karim $31.00
by Sanapiah Faisal $9.00
by Zairin Harahap $9.00
by I Kethut Ardhana $18.00
by Perserikatan Bangsa-Bangsa $7.00