Davis, John
Comm. Royale D'Enquete sur Les Perspectives Economiques du Canada , 1957
Buku Teks
Bobrow, Davis B.
Free Press, 1979
Buku Teks
Sheahan, John
University Press 1963, 1963
Buku Teks
Cashman, John R.
CRC Press, Taylor & Francis Group, 2008
Buku Referensi
Kotz, John C., author
Saunders College Publishing, 1987
Buku Teks