Preston, Paul, author
Dorsey Press, 1986
Buku Teks
Thomas, Hugh, author
Harper & Brothers, 1961
Buku Teks
Cattell, David T.
University of California Press, 1957
Buku Teks
Jackson, Gabriel
Princeton University Press, 1972
Buku Teks
Brenan, Gerald
Cambridge University Press, 1993
Buku Teks