East, Sara Toll, author
H.W. Wilson, 1963
Buku Teks
Dell Publishing, 1967
Buku Teks
Tribe, Laurence H., author
Foundation Press, 1979
Buku Teks
Hurst, James Willard, author
Little, Brown, 1950
Buku Teks
Thistlethwaite, Frank, author
Cambridge University Press, 1955
Buku Teks