edited by Helmut Kallmann, Gilles Potvin and Kenneth Winters
University of Toronto Press, 1981
Buku Referensi
Westrup, J. A., author
William Collins Sons, 1959
Buku Referensi
Wade-Matthews, Max, author
Southwater, 2013
Buku Teks
Manzer, Ronald A., author
McGraw-Hill Ryerson, 1974
Buku Teks
McInnis, Edgar
Holt, Rinehart and Winston of Canada, 1982
Buku Teks