APA (7th ed.) Citation

Harman, G. (1975). If and modus ponens (Rev. version.). IU Linguistics Club.

Chicago Style (17th ed.) Citation

Harman, Gilbert. If and Modus Ponens. Rev. version. Bloomington, Ind: IU Linguistics Club, 1975.

MLA (9th ed.) Citation

Harman, Gilbert. If and Modus Ponens. Rev. version. IU Linguistics Club, 1975.