by Aziz Alimul $7.00
by Nursalam $11.00
by Prof. dr. Sjaiful Daili, dr. Wresti Indriatmi B.M. $9.00
by Suhardjo, dkk $6.00
by Hutabarat, Sahala & Evans, Stewart M $6.00
by Guenther, Ernest $9.00