Artikel Jurnal
Rahmat Saptono, author
Lembaga Penelitian Universitas Indonesia, 2002
Artikel Jurnal
Nippon Steel Corporation, [date of publication not identified]
Buku Referensi
Sachar, Luis
Laurel Leaf Books, 1998
Buku Teks
Sachar, Luis
Laurel Leaf Books, 1998
Buku Teks