by Jan Takasihaeng $7.00
by Prof. DR. dr. S.M. Lumbantobing, SpS(K), SpKJ $6.00
by Nursalam $9.00
by Lyle W. Morgan II, Ph.D., HMD $7.00
by Jonni M.S, M.Sitorus, Nelly K $7.00
by Prianto & Fritz $30.00