Artikel Jurnal
Tan, Thong Kie, author
Alumni, 1987
Buku Teks
Kaligis, O.C. (Otto Cornelis), 1942-, author
O.C. Kaligis & Associates, 2002
Buku Teks
Simorangkir, J.C.T., author
Binacipta, 1980
Buku Teks
[publisher not identified], [date of publication not identified]
Buku Teks