Dell Publishing, 1967
Buku Teks
Corbett, Jim, 1875-1955
Oxford University Press, 1991
Buku Teks
Morse, Stephen A., author
McGraw-Hill , 1967
Buku Teks
Dunning, James Morse
Harvard University Press, 1974
Buku Teks
Dunning, James Morse
Harvard University Press, 1979
Buku Teks