APA (7th ed.) Citation

Copi, I. M. (1971). The theory of logical types. Routledge and K. Paul.

Chicago Style (17th ed.) Citation

Copi, Irving M. The Theory of Logical Types. London: Routledge and K. Paul, 1971.

MLA (9th ed.) Citation

Copi, Irving M. The Theory of Logical Types. Routledge and K. Paul, 1971.