Não informado. (1968). Canadian agricultural insect pest review. Department of Agriculture, Information Division.
Chicago-referens (17:e uppl.)Não informado. Canadian Agricultural Insect Pest Review. Ottawa: Department of Agriculture, Information Division, 1968.
MLA-referens (8:e uppl.)Não informado. Canadian Agricultural Insect Pest Review. Department of Agriculture, Information Division, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.