Fessenden, Ralph J., author
Wilard Grant Press, 1979
Buku Teks
Baker, A. David, author
West Publishing, 1992
Buku Teks
English, James, author
McGraw-Hill, 1956
Buku Teks
Gnanou, Yves, author
John Wiley & Sons Inc, 2008
Buku Teks
Griffin, Rodger W., author
McGraw-Hill, 1969
Buku Teks