by Guenther, Ernest $9.00
by Ir. Abbas Siregar Djarijah $6.00
by Ir. Hieronymus Budi Santoso dan Heru Respati $5.00
by Ir. Joko Mulyanto $0.00
by Weaver, Rip $7.00
by Munandar. S.C. Utami (Ed) $5.00