Crank, John
Oxford Univ. Press , 1962
Buku Teks
Saywell, John J.
University of Toronto Press , 1957
Buku Teks
New Canada Publications, 1980
Buku Teks
Fullerton, D.H.
Royal Commission on Canada's Economic Prospects, 1957
Buku Teks
The American Society of African Culture, 1966
Buku Teks