Carrell, Michael R., author
Prentice-Hall, 1995
Buku Teks
Nur Fathonah, author
Universitas Indonesia, 2014
Artikel Jurnal
Longenecker, Justin G.
Charles E. Merril, 1981
Buku Teks
Thomas, Joe G.
Houghton Miffiln, 1990
Buku Teks
Dahara Prize, , 1992
Buku Teks