by Prof. DR. dr. S.M. Lumbantobing, SpS(K), SpKJ $6.00
by JP. Chaplin $16.00
by Prof. Hembing Wijayakusuma $7.00
by Dr. Menaldi Rasmin, SpP(K), Dr. Pudji K S $6.00
by Dr. Sirajuddin Zar $6.00
by Prof. Dr. H. Abuddin Nata, M.A $11.00