by Pindi Kisata, S. Kom $6.00
by Tom Kelly & Jonathan Littman $13.00
by Kasmir, S.E., M.M $7.00
by Salah Wahab $9.00
by Drs. H. Moh. Pabundu Tika, M.M $7.00
by Dergibson Siagian & Sugiarto $13.00