United States. President (1837-1841 : Van Buren), Martin Van Buren (1838). “Message from the President of the United States to the Two Houses of Congress: At the Commencement of the Third Session of the Twenty-fifth Congress”, p.13
"Some Notes on Workers' Education" by A. J. Muste, first published in "New International", Volume 2, No. 7 (pp. 225-227), www.marxists.org. December 1935.