Keirstead, Burton Seely, author
Oxford University Press, 1956
Buku Teks
Eayrs, James, author
Oxford University Press, 1959
Buku Teks
Lingard, C. Cecil, author
Oxford University Press, 1950
Buku Teks
Angus, H.F.
University of Toronto Press , 1953
Buku Teks
edited by Stephen Clarkson
The Canadian, 1968
Buku Teks