https://en.wikipedia.org/wiki/John_Roemer
https://www.jstor.org/stable/27903820?Search=yes&resultItemClick=true&searchText=au:&searchText=%22John%20E.%20Roemer%22&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3Dau%253A%2522John%2BE.%2BRoemer%2522&refreqid=search%3A73d892001c31503ae2bfbca8955e5f11&seq=1#page_scan_tab_contents
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-John E. Roemer, A General Theory of Exploitation and Class,
https://www.jstor.org/stable/27903820?Search=yes&resultItemClick=true&searchText=au:&searchText=%22John%20E.%20Roemer%22&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3Dau%253A%2522John%2BE.%2BRoemer%2522&refreqid=search%3A73d892001c31503ae2bfbca8955e5f11&seq=1#page_scan_tab_contents
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-John E. Roemer, A General Theory of Exploitation and Class,