Wright, Paul H., author
John Wiley & Sons, 1979
Buku Teks
Wright, Paul H., author
John Wiley & Sons, 1979
Buku Teks
Oglesby, Clarkson H. (Clarkson Hill), 1908-, author
John Wiley & Sons, 1982
Buku Teks
Macpherson, Gavin, author
Longman, 1993
Buku Teks
Japan International cooperation agency, 1977
Buku Teks