McCrimmon, James M.
Houghton Miffiln, 1963
Buku Teks
Flesch, Rudolf
Harper & Row Publishers, 1962
Buku Teks
Ruggiero, Vincent Ryan, author
Alfred Publishing Co., Inc., 1981
Buku Teks
Caruso, Domenick, author
W.W. Norton, 1977
Buku Teks
Perrin, Porter G., author
Scott, Foresman, 1950
Buku Teks