Menuju kesejahteraan manusia : kumpulan tulisan dari seminar-seminar IKALUNTAG / T.O. Ihromi ... [et al.] ; kata pengantar, O.E. Panjaitan.
Yayasan Sumber Agung, 1003
 Buku Teks
Ethnic conflicts in Southeast Asia
edited by Kusuma Snitwongsa and W. Scott Thompson
ISEAS, 2005
 Buku Teks SO
Regulating business : the search for an optimum / Editor Donald P. Jacobs ... [et al.]
Institute for Contemporary Studies, 1979
 Buku Teks
Save the birds / Rudolph L. Schreiber ... [et al.]
Houghton Mifflin, 1989
 Buku Teks
Pengantar ekonomi perusahaan/ Edilius.....( et al)l
oleh Edilius ... [and others]
Rineka Cipta, 1992
 Buku Teks SO