by Henry Simamora, S.E $18.00
by Christopher Flavin, Nicholas Lenssen $6.00
by Ny. Susmayati, B.A dan Ny. Hj. Asnidar $7.00
by Prof. DR. Taliziduhu Ndraha $11.00
by Ir. Mul Muyani Sutedjo $7.00
by Prof. Dr. Suharsimi Arikunto $11.00