APA (7th ed.) Citation

Graf, U., & Graf, R. (1980). The Wittgenstein-papers van Herman de Vries.

Chicago Style (17th ed.) Citation

Graf, Urs, and Rös Graf. The Wittgenstein-papers Van Herman De Vries. 1980.

MLA (9th ed.) Citation

Graf, Urs, and Rös Graf. The Wittgenstein-papers Van Herman De Vries. 1980.

Warning: These citations may not always be 100% accurate.