Richard Wolff and Gar Alperovitz have both written about alternative economies based in part or in whole on worker cooperatives. If you're just curious about how worker cooperatives work in the existing economy, read up about Mondragon or the South Mountain Company. A good book about the latter, written by its founder, is Companies We Keep by John Abrams.
http://www.chelseagreen.com/business-economy/companies-we-ke...