Start with : Anarchist Archives
Some books are available at: University of Strathclyde, Library via Archives and Special Collections reading room:
– The Herald of revolt. London : Guy A. Aldred 1913-14.
– Trade unionism and the class war. 2nd ed., rev.. London : Bakunin Press 1919.
– Michael Bakunin : communist. Glasgow : The Bakunin Press 1920.
–  Socialism or parliament : a burning question of to-day. Glasgow : Bakunin Press 1926.
– The Commune. Glasgow : Bakunin Press 1927-1929
– Government by labor; a record of facts. Glasgow, Bakunin Press 1928
– The council. Glasgow : Bakunin Press 1931-1933
– Towards the social revolution? : whither the I.L.P.? : concerning the questions of unity ... as stated in correspondence between the I.L.P. and Guy A. Aldred. Glasgow : Guy A. Aldred 1934.
– Letters to the editor. Glasgow : The Strickland Press 1940.- The New spur. Glasgow : Guy A. Aldred 1934.
– The United socialist. Glasgow : Guy A. Aldred 1934.
– Hyde Park : organ of the Hyde Park Movement, London. Glasgow : Guy Aldred 1938-
– Pioneers of anti-parliamentarism. Glasgow, Strickland Press 1940
– Studies in communism. Glasgow, Strickland Press 1940.
– The C.O., the tribunal and after : a guide for conscientious objectors, explaining their rights and status under the National Service (Armed Forces) act. Glasgow and West of Scotland No-Conscription League. Advisory Bureau.
London ed.. Glasgow : The Strickland Press 1940
– The rebel and his disciples. Glasgow, Strickland Press 1940.
– Dogmas discarded; an autobiography of thought, 1886-1908. Glasgow, Strickland Press 1940-
– Socialism and Parliament ... Glasgow, The Strickland press 1942.
– Communism; story of the Communist Party. Glasgow, Strickland Press 1943
– A call to manhood, and other studies in social struggle; 26 essays Glasgow, The Strickland press 1944.
– Peace now—and for ever, Glasgow, The Strickland Press 1945
– At grips with war. 3d ed.. Glasgow, Strickland Press 1947
– Guy Aldred’s election address Glasgow : Strickland Press 1950.
– The word quarterly. Glasgow : Strickland Press 1950-1967
– No traitor’s gait! : the autobiography of Guy A. Aldred Glasgow : Strickland Press 1955.
– John. Caldwell Guy A. Aldred, 1886-1963. Glasgow : Strickland Press 1966?
– The two nations: a May-day message. Glasgow, Strickland P. 1968