Catling, P.M., R.A. Layberry, J.P. Crolla, P.W. Hall.1997. Increase in populations of Henry’s Elfin, Callophrys henrici, (Lepidoptera: Lycaenidae), in Ottawa-Carleton, Ontario, associated with man-made habitats and Glossy Buckthorn thickets. Canadian Field-Naturalist, 112 (1):2.
Hall, P.W. 2002. The Giant Jamaican Swallowtail (Papilio homerus) – Going, going... Biodiversity: Journal of Life on Earth, 3(1):21.
Hall. P. 2007. The European Common Blue Polyommatus icarus: new alien butterfly to Canada and North America. News of the Lepidopterists’ Society, 5(1):111.
Hall, P. (chair, board of editors). 2008. Biodiversity and Climate Change. Biodiversity: Journal of Life on Earth. 9 (3&4).
Hall, P.W., P.M. Catling, J.D. Lafontaine. 2011. Insects at Risk in the Prairie Region, from Floate, K. (ed.) Arthropods of Canadian Grasslands: (Vol. 2) Inhabitants of a Changing Landscape. Biological Survey of Canada, Ottawa.
Hall, P.W. 2014. Conservation of Butterflies in Ontario. American Butterflies, Vol. 21, N. 3/4: 26-32.
Hall, P. W., P.M. Catling, P.L. Mosquin, T. Mosquin. European Skipper butterfly (Thymelicus lineola) associated with reduced seed development of Showy Lady’s-slipper orchid (Cypripedium reginae) (in prep.) .
Peterson A.T., E. Martínez-Meyer, C. González-Salazar, and P. W. Hall. 2004. Modeled climate change effects on distributions of Canadian butterfly species. Canadian Journal of Zoology, 82(6): 851–858.
Hall, P.W., C.D. Jones, A.E. Guidotti, B. Hubley. 2014. The ROM Field Guide to Butterflies of Ontario. Royal Ontario Museum, Toronto.
Layberry, R.A., P.W. Hall, J.D. Lafontaine. 1998. The Butterflies of Canada. University of Toronto Press and NRC Research Press, Toronto.
Hall, P., R. Layberry, D. Lafontaine. 1996. Checklist of the Butterflies of the Ottawa District. Ottawa Field-Naturalists’ Club, Ottawa.
Layberry, R.A., J.D. Lafontaine, P.W. Hall. 1982. Butterflies of the Ottawa District. Trail and Landscape, Ottawa Field Naturalists’ Club, 16(1):3-59.
Hall, P.W. 2009. Sentinels on the Wing: The Status and Conservation of Butterflies in Canada, NatureServe Canada, Ottawa.
Canadian National Collection of Insects, Arachnids and Nematodes
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