by Ir. Hieronymus Budi Santoso $5.00
by Robert J. Wicks $6.00
by Drs. Save M. Dagun $7.00
by - $20.00
by Ir. Setijo Pitojo $6.00
by Kartini Kartono $6.00
by S.M. Ardan $9.00
by Bert van der Heijden, SCI. $4.00
by Dr. Thariq M.As-Suwaidan dan Ir. Faisal Umar Basyarahil $11.00
by Yusuf al-Uqshari $7.00
by Prof. Dr. Kees Bertens, MSC $7.00
by - $12.00