edited by S.H. Steinberg and John Paxton
MacMillan St Martin's Press, 1969
Buku Referensi
edited by Brian Hunter
Macmillan, 1992
Buku Referensi
Dulles, Foster Rhea, author
Houghton-Mifflin, 1945
Buku Teks
Sassoon, Rosemary, author
Routledge , 1999
Buku Teks
Woodham, Jonatham M., author
Oxford University Press, 1997
Buku Teks