Cita APA (7a ed.)

Morris, C. W. (1970). Foundations of the theory of signs. University of Chicago Press.

Cita Chicago Style (17a ed.)

Morris, Charles William. Foundations of the Theory of Signs. Chicago [etc.]: University of Chicago Press, 1970.

Cita MLA (9a ed.)

Morris, Charles William. Foundations of the Theory of Signs. University of Chicago Press, 1970.