by WK $12.00
by Brooks $18.00
by S. Wibowo $13.00
by Chung Su Hoo & Ng Gek Lan $5.00
by Prof. DR. dr. S.M. Lumbantobing, SpS(K), SpKJ $6.00
by WK $11.00
by Dra. M. Sri Sulastri Rifai, M.Pd $6.00