by Donald A. Chu, Ph.D $6.00
by Agusnawar $6.00
by Henry Simamora, S.E $18.00
by Sulistyowati Irianto, Lim Sing Meij, Firliana Purwanti $9.00
by Ghufron A. Mas'adi $6.00
by Anwar, Moh. Arsjad, dkk $6.00