APA (7th ed.) Citation

Filter, W., & Weber, K. (2020). Integration theory. [Routledge].

Chicago Style (17th ed.) Citation

Filter, Wolfgang, and Karl Weber. Integration Theory. [Place of publication not identified]: [Routledge], 2020.

MLA (9th ed.) Citation

Filter, Wolfgang, and Karl Weber. Integration Theory. [Routledge], 2020.