by WK $18.00
by Ir. Abbas Siregar Djarijah $5.00
by Thabrani $13.00
by Ny. Susmayati, B.A $7.00
by Ir. H. Rahmat Rukmana $5.00
by N. Edy Soetanto, BE. $5.00
by Gunawan Widjaja & Kartini Mulyadi $7.00
by FK3 $7.00
by $4.00