"Physiographic Regions". Natural Resources Canada. 12 September 2016. Retrieved May 28, 2020.
canada.ca
Canada, Environment and Climate Change (January 9, 2007). "St. Lawrence River: overview". Environment Canada. Retrieved May 29, 2020.
ccea.org
The map on page 11 shows the 15 terrestrial ecozones as defined at that time by the CCEA as well as the much larger terrestrial ecozone to the north—the boreal shield and the Atlantic Maritime terrestrial ecozone, which lies to the south and east.
Ecological Stratification Working Group (ESWG) (1995). A National Ecological Framework for Canada. Ottawa/Hull: Agriculture and Agri-Food Canada and Environment Canada. Retrieved May 30, 2020.
Stadel, Christoph (2009). "Core areas and peripheral regions of Canada: Landscapes of contrast and challenges". In Luzon, J.L.; Cardim, M (eds.). Estudio de casos Sobre planificación regional(PDF). Barcelona.{{cite book}}: CS1 maint: location missing publisher (link)