Dulfano, Celia
Jassey-Bass , 1992
Buku Teks
Sargent, Margaret, author
Longman Chesire, 1979
Buku Teks
edited by Jack H. Mendelson and Nancy K. Mello
McGraw-Hill, 1979
Buku Teks
Robinson, David, author
University Park Press, 1979
Buku Teks
edited by Griffith Edwards and Marcus Grant
University Park Press, 1980
Buku Teks