Swan, M., & Walter, C. How english works: A grammar practice book with answers.
Citação norma ChicagoSwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book with Answers.
Citação norma MLASwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book with Answers.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.