The University of Calgary rough fescue prairie reserve: current use and strategies for the future, a report by the Grounds Department 

Sonchus arvensis Linnaeus subsp. arvensis 

Sonchus asper (Linnaeus) Hill 

By-laws of the Township of London, Middlesex County : with historical sketch of pioneer days and important occurrences of recent dates : consolidated and approved by Council of year 1910 

Sonchus arvensis subsp. uliginosus (M. Bieberstein) Nyman 

Sonchus oleraceus Linnaeus 

Statutes of the Province of Alberta 1929 

Statutes of the Province of Alberta 1908 

Statutes of Alberta 1927 

Revised Statutes of Alberta 1955 Volume 3 

Revised Statutes of Alberta 1970 Volume 5 

Alberta Bills: 7th Legislature, 2nd Session 

Alberta Bills: 9th Legislature, 1st Session 

Alberta Bills: 6th Legislature, 1st Session 

Coaldale, AB. Bylaws, 1999 

Grimshaw AB., Rescinded, 701-866 

Brooks, AB. Bylaws, 1982 

Mundare, AB., Bylaws, 1997 

Medicine Hat, AB., Bylaws, 1980 

Medicine Hat, AB., Bylaws, 1991 

Bruderheim, Alberta, Bylaws, 1986 

Sundre, Alberta, Bylaws, 1995 

Canmore Alberta Bylaws 1992 

Canmore Alberta Bylaws 1992 

Public health magazine and literary review. Vol. 2, no. 10 (April, 1877) 

Key to plants of the farming and ranching areas of the Canadian prairies, A 

The Chernochan machine shed : a land use and structural history