Japan International cooperation agency, 1977
Buku Teks
Nippon Steel Corporation, [date of publication not identified]
Buku Referensi
Leslie D. "Doc" Long, Clifford Gordon, Charles F. Peck, Jack R. Benjamin
McGraw-Hill, 1982
Buku Referensi
Hurlbut, Cornelius S., author
John Wiley & Sons, 1977
Buku Teks
Browning, Carl H., author
Oxford University Press, 1937
Buku Referensi