by Nazar, Freddy $6.00
by Prof. J. Suprapto, M.A. APU $11.00
by Oppusunggu, H.M.T $5.00
by Adler Haymans Manurung $6.00
by A.H. Manurung, S.E $7.00
by Kamaruddin Ahmad., S.E $7.00