edited by Fabrizio Fabris, Luigi Pernigotti and Ermanno Ferrario
Raven Press, 1990
Buku Teks
Thompson, Janice, author
Pearson, 2016
Buku Teks
Beal, Virginia A.
Macmillan, 1986
Buku Teks
Alford, Betty B.
Prentice-Hall, 1982
Buku Teks
edited by Jane B.Morgan, John W.T.Dickerson,
John Wiley & Sons, 2003
Buku Teks