Briggs, A., & Pollard, S. (1959). Robert Owen in Retrospect. A Co-operative Pioneer. Loughborough: Coperative Union.
Lua i Stíl Chicago (17ú heag.)Briggs, A., agus Sidney Pollard. Robert Owen in Retrospect. A Co-operative Pioneer. Loughborough: Coperative Union, 1959.
Lua MLA (8ú heag.)Briggs, A., agus Sidney Pollard. Robert Owen in Retrospect. A Co-operative Pioneer. Loughborough: Coperative Union, 1959.
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