by Sofyan Syafri Harahap $16.00
by Drs. Muchdarsyah Sinungan $9.00
by Koentjaraningrat $6.00
by Ernest Dichter $9.00
by Koeswinarno $9.00
by Julius R. Latumaerissa, S.E., M.M $7.00
by Nyoman S. Pendit $13.00
by Muhisom Setiaki $6.00
by Suprihatin $8.00