Cita APA (7a ed.)
Spencer-Brown, G. Laws of form. Cognizer Connection.
Cita estilo Chicago (17a ed.)
Spencer-Brown, G. Laws of Form. Portland, EUA: Cognizer Connection.
Cita MLA (9a ed.)
Spencer-Brown, G. Laws of Form. Cognizer Connection.
Precaución: Estas citas no son 100% exactas.