Morison, Samuel Eliot, author
Oxford University Press, 1949
Buku Teks
Hofstadler, Richard, author
Prentice-Hall, 1895
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1972
Buku Teks
Patrick, John
Macmillan Publishing Company, 1984
Buku Teks
Quint, Howard H
Dorsey Press, 1968
Buku Teks