MLA

Swiggers, Pierre, and Alfons Wouters. Grammatical Theory and Philosophy of Language In Antiquity. Leuven: Peeters, 2002.

APA

Swiggers, P., & Wouters, A. (2002). Grammatical theory and philosophy of language in Antiquity. Leuven: Peeters.

Chicago

Swiggers, Pierre ed., and Alfons Wouters ed. Grammatical Theory and Philosophy of Language In Antiquity. Leuven: Peeters, 2002.