by Prof. Dr. Ir. Tri Yuwanta S.U., DEA $7.00
by J. Donald Walters $5.00
by AAK (Aksi Agraris Kanisius) $6.00
by Bachrawi Sanusi, S.E $7.00
by Slamet Soeseno $5.00
by Ir. A. G. Kartasapoetra $6.00