by $7.00
by Drs. Firman B. Aji dan Drs. Martin Sirait $9.00
by Dr. Ismail Abdul Mutalib Al-Khatib $5.00
by Hans Antlov, Sven Cederroth $8.00
by Ir. Rustam Hakim, M.T., IALI $9.00
by Radiks Purba $12.00
by Henry Simamora, S.E $18.00
by WK $12.00