Butt, J., Benjamin, C., & Rodrâiguez, A. M. (2019). A new reference grammar of modern Spanish (6th edition.). Routledge.
Chicago Style (17th ed.) CitationButt, John, Carmen Benjamin, and Antonia Moreira Rodrâiguez. A New Reference Grammar of Modern Spanish. 6th edition. London, New York: Routledge, 2019.
MLA (9th ed.) CitationButt, John, et al. A New Reference Grammar of Modern Spanish. 6th edition. Routledge, 2019.
Warning: These citations may not always be 100% accurate.