Cita APA (7th ed.)
Spencer-Brown, G. Laws of form. Cognizer Connection.
Cita Chicago (17th ed.)
Spencer-Brown, G. Laws of Form. Portland, EUA: Cognizer Connection.
Cita MLA (9th ed.)
Spencer-Brown, G. Laws of Form. Cognizer Connection.
Atenció: Aquestes cites poden no estar 100% correctes.