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![Cover for R. Cavallo · The Role of Systems Methodology in Social Science Research - Frontiers in System Research (Paperback Book) [Softcover reprint of the original 1st ed. 1979 edition] (2011)](https://imusic.b-cdn.net/images/item/original/382/9789400992382.jpg?r-cavallo-2011-the-role-of-systems-methodology-in-social-science-research-frontiers-in-system-research-paperback-book&class=scaled&v=1610618922)
![Cover for R. Cavallo · Systems Methodology in Social Science Research: Recent Developments - Frontiers in System Research (Paperback Book) [Softcover reprint of the original 1st ed. 1982 edition] (2010)](https://imusic.b-cdn.net/images/item/original/089/9789048158089.jpg?r-cavallo-2010-systems-methodology-in-social-science-research-recent-developments-frontiers-in-system-research-paperback-book&class=scaled&v=1582263634)