Saussure, Ferdinand de, author
Peter Owen, 1960
Buku Teks
Lamberton, D.M.
Tudor Press, 1970
Buku Teks
Dessler, Gary, 1942-, author
Prentice-Hall, 2009
Buku Teks
Laudon, Kenneth C., 1944-, author
Macmillan, 1991
Buku Teks
Hicks, Philip E., author
McGraw-Hill, 1998
Buku Teks