by AAK $5.00
by Ir. M. Lies Suprapti $5.00
by Djoehana Setyamidjaja, M.Ed $7.00
by Nunung Marlina Djarijah & Ir. Abbas Siregar Djarijah $6.00
by Komlit KWI $3.00
by Jonni M.S, M.Sitorus, Nelly K $7.00