Ritchie, Charles
Macmillan of Canada, 1974
Buku Teks
introduction by Paul Goldberger
Monacelli Press, 2002
Buku Teks
Symons, Julian, author
Arthur Barker, 1951
Buku Teks
Fielding, K.J., author
Longman, Green, 1953
Buku Teks
Roberts, Don D.
Mouton, 1973
Buku Teks