Cita APA (7a ed.)

Ketner, K. L. (1996). Elements of logic: An introduction to Peirce's existential graphs. Arisbe Associates.

Cita Chicago Style (17a ed.)

Ketner, Kenneth Laine. Elements of Logic: An Introduction to Peirce's Existential Graphs. Lubbock, TX: Arisbe Associates, 1996.

Cita MLA (9a ed.)

Ketner, Kenneth Laine. Elements of Logic: An Introduction to Peirce's Existential Graphs. Arisbe Associates, 1996.