Becker, Jillian, author
Fischer Taschenbuch Verlag, 1978
Buku Teks
Russell, Richard Joel, author
Macmillan, 1954, 1951
Buku Teks
Russell, Richard Joel, author
Macmillan, 1958
Buku Teks
Buku Teks
Elliott, William D., author
Twayne Publishers, 1975
Buku Teks