APA (7th ed.) Citation

Giunchiglia, F., & Walsh, T. (1990). A theory of abstraction.

Chicago Style (17th ed.) Citation

Giunchiglia, Fausto, and Toby Walsh. A Theory of Abstraction. Edinburgh, 1990.

MLA (9th ed.) Citation

Giunchiglia, Fausto, and Toby Walsh. A Theory of Abstraction. 1990.

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