Berry 1989, p. 455; Spannos 2012, p. 45. Spannos, Chris (2012). "Examining the History of Anarchist Economics to See the Future". In Shannon, Deric; Nocella II, Anthony; Asimakopoulos, John (eds.). The Accumulation of Freedom. Oakland, Edinburgh, Baltimore: AK Press. pp. 42–63. ISBN978-1849350945. LCCN2011936250.
Spannos 2012, p. 45. Spannos, Chris (2012). "Examining the History of Anarchist Economics to See the Future". In Shannon, Deric; Nocella II, Anthony; Asimakopoulos, John (eds.). The Accumulation of Freedom. Oakland, Edinburgh, Baltimore: AK Press. pp. 42–63. ISBN978-1849350945. LCCN2011936250.
Spannos 2012, p. 52. Spannos, Chris (2012). "Examining the History of Anarchist Economics to See the Future". In Shannon, Deric; Nocella II, Anthony; Asimakopoulos, John (eds.). The Accumulation of Freedom. Oakland, Edinburgh, Baltimore: AK Press. pp. 42–63. ISBN978-1849350945. LCCN2011936250.
Spannos 2012, p. 57. Spannos, Chris (2012). "Examining the History of Anarchist Economics to See the Future". In Shannon, Deric; Nocella II, Anthony; Asimakopoulos, John (eds.). The Accumulation of Freedom. Oakland, Edinburgh, Baltimore: AK Press. pp. 42–63. ISBN978-1849350945. LCCN2011936250.