by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Abel Tasman $6.00
by Dr. Suhartono $7.00
by Ir. H. Sudirman, Mpi & Prof. DR. Ir. Achmad Mellawa $9.00
by Masnur Muslich $9.00
by Prof. Dr. Suharsimi Arikunto $13.00