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Sheffield, Cory S.; Westby, Sue M.; Smith, Robert F.; Kevan, Peter G. (September 2008). "Potential of bigleaf lupine for building and sustaining Osmia lignaria populations for pollination of apple". The Canadian Entomologist. 140 (5): 589–599. doi:10.4039/n08-011. hdl:10214/2430. ISSN0008-347X.
Sheffield, Cory S.; Westby, Sue M.; Smith, Robert F.; Kevan, Peter G. (September 2008). "Potential of bigleaf lupine for building and sustaining Osmia lignaria populations for pollination of apple". The Canadian Entomologist. 140 (5): 589–599. doi:10.4039/n08-011. hdl:10214/2430. ISSN0008-347X.
Sheffield, Cory S.; Westby, Sue M.; Smith, Robert F.; Kevan, Peter G. (September 2008). "Potential of bigleaf lupine for building and sustaining Osmia lignaria populations for pollination of apple". The Canadian Entomologist. 140 (5): 589–599. doi:10.4039/n08-011. hdl:10214/2430. ISSN0008-347X.