APA (7th ed.) Citation

Wright, G. H. v. (1972). An essay in modal logic. University Microfims.

Chicago Style (17th ed.) Citation

Wright, G. H. von. An Essay in Modal Logic. Ann Arbor, Mich.: University Microfims, 1972.

MLA (8th ed.) Citation

Wright, G. H. von. An Essay in Modal Logic. University Microfims, 1972.