by Mark Victor Hansen & Robert G. Allen $18.00
by Bungaran Antonius Simanjuntak $23.00
by Ir. Yushinta Fujaya, M.Si $7.00
by Fathurin Zein $9.00
by Ny. Susmayati, B.A dan Ny. Hj. Asnidar $6.00
by Kusno Budi Santoso dan S. Ary Soewendo $11.00