Currie, A.W.
Thomas Nelson, 1951
Buku Teks
Armstrong, Muriel
Prentice Hall of Canada, 1977
Buku Teks
edited by R.C. Bellan, W.H. Pope
McGraw-Hill, 1981
Buku Teks
Bladen, V.W.
University of Toronto Press, 1959
Buku Klasik
Shutt, R.C.
Longman Scientific and Technical, 1995
Buku Teks