* [https://runeberg.org/salmonsen/2/20/1100.html ''Salmonsens Konversationsleksikon'', 2. udgave, bind XX (1926), s. 1068-1069; opslag: Scheffer, 1. Carl Frederik S.]
* [http://nile.lub.lu.se/ojs/index.php/scandia/article/viewFile/1196/982 Bo Gustafsson: "Hur fysiokratisk var den svenska fysiokratismen?" (''Scandia'', bind 42 (1976), nr 1)]{{Dødt link|date=marts 2022 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://nile.lub.lu.se/ojs/index.php/scandia/article/view/1197/983 Lars Herlitz: "Härtappad fysiokratism" (''Scandia'', bind 42 (1976), nr 1)] {{Webarchive|url=https://web.archive.org/web/20220216232750/https://journals.lub.lu.se/index.php/scandia/article/view/1197/983 |date=16. februar 2022 }}
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