* [http://www.lawsofform.org/aum/session1.html Spencer-Brown's talks at Esalen 1973] — Self-referential forms are introduced in the section entitled "Degree of Equations and the Theory of Types"
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* [http://www.math.uic.edu/~kauffman/ Louis H. Kauffman] — ''[http://www.math.uic.edu/~kauffman/Arithmetic.htm Box Algebra, Boundary Mathematics, Logic, and Laws of Form]''
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*[http://www.helsinki.fi/science/commens/terms/graphlogi.html Logical Graph] @ [http://www.helsinki.fi/science/commens/dictionary.html Commens Dictionary of Peirce's Terms]
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*[http://www.lawsofform.org/ ''Laws of Form'' Web Site]
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*[http://www.lawsofform.org/aum/session1.html Spencer-Brown's talks at Esalen 1973] — Self-referential forms are introduced in the section entitled "Degree of Equations and the Theory of Types"
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*[http://www.math.uic.edu/~kauffman/ Louis H. Kauffman] — ''[http://www.math.uic.edu/~kauffman/Arithmetic.htm Box Algebra, Boundary Mathematics, Logic, and Laws of Form]''