Jarvis, Helen, author
Prentice-Hall, 2001
Buku Teks
edited by William A. Robson
Macmillan, 1955
Buku Teks
Taylor, Griffith, author
Methuen, 1951
Buku Teks
Taylor, Griffith, author
Methuen, 1949
Buku Teks
edited by Robert Moore Fisher
Doubleday, 1955
Buku Teks