Friesen, Gerald, author
University of Toronto Press, 1984
Buku Teks
McDougall, J. Lorne
McGill University Press, 1968
Buku Teks
Pacey, Desmond, author
Ryerson Press, 1952
Buku Teks
Reid, J. H. Stewart
Longmans, Green and Co. , 1959
Buku Teks
Ware, Norman J
Russel & Russell, 1970
Buku Teks