by dr. Iwan Ikayuda, dr. Sukonto K., Prof. dr. Sjahriar R $20.00
by Tarwoto $9.00
by Prof. DR. dr. S.M. Lumbantobing, SpS(K), SpKJ $6.00
by Prof. Dr. Soekidjo Notoatmodjo $11.00
by Prof. Hembing Wijayakusuma $7.00
by Jansen Silalahi $7.00