by M. Firdaus $7.00
by George R. Terry $9.00
by - $12.00
by FMIPA Universitas Indonesia $6.00
by Prof. S.H. Rewoldt $7.00
by A.H. Manurung, S.E $6.00
by Dra. Hj. Etin Solihatin, M.Pd, Rahardjo, S.Pd $7.00
by WK $13.00