Tindal, C. Richard
Nelson Thomson Learning, 2000
Buku Teks
Crawford, Kenneth Grant
University of Toronto Press, 1958
Buku Teks
Dawson, Robert MacGregor
The Univ. of Toronto Press , 1959
Buku Teks
Dawson, Robert MacGregor
Vancouver The Copp Clark Publshing Co. 1957,
Buku Teks
chapters by Edgar McInnis ... [et al.] ; edited by George W. Brown
University of California Press, 1953
Buku Teks