Trewin, J.C.
Longmans , 1951
Buku Teks
Schoch, Richard W., author
Cambridge University Press , 2016
Buku Teks
Schneider, Ben Ross, Jr., author
Addison-Wesley, 1974
Buku Teks
edited, Bart Moore-Gilbert, John Seed
Routledge, 1992
Buku Teks
Hewison, Robert, 1943-, author
Methuen, 1995
Buku Teks