Melvin, Michael, author
HarperCollins, 1995
Buku Teks
Nehr, Lee Charles, author
International Textbook, 1967
Buku Teks
Nehr, Lee Charles, author
Intext Educational, 1972
Buku Teks
Dornbusch, Rudiger, author
Basic Books, 1980
Buku Teks
Baker, James C., author
Prentice-Hall, 1998
Buku Teks