BB Bandis, Angela y Shotton, Diana. Close-up. C2. Hanpshire: National Geographic, 2018 [ISBN 978-4080-9833-2]
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BB HEWINGS, M. Advanced grammar in use : a self-study reference and practice book for advanced learners of English : with answers and cd-rom. 3rd ed.. 3rd printing. [s. l.]: Cambridge University Press, 2014. ISBN 0521498686.
BB MURPHY, R. English grammar in use : a self-study reference and practice book for intermediate leaners of English :with answers. 5th ed. [s. l.]: University Press, 2019. ISBN 9781108457651.
BB Strutt, Peter. English for international tourism: Upper Intermediate CourseBook. Harlow: Pearson, 2013 [ISBN 9781447923916]
BB VINCE, M.; SUNDERLAND, P. Advanced language practice : with key : English grammar and vocabulary. [repr.]. [s. l.]: Macmillan Education, 2007. ISBN 1405007621.
BC CIUPE, A. Oxford University Press, Oxford Advanced Learner’s Dictionary 10th edition (Android App). Lingua (Language & Culture), [s. l.], v. 20, n. 1, p. 139–142, 2021.
BC EASTWOOD, J. Oxford practice grammar : with answers. 2nd ed.,[4th impr.]. [s. l.]: Oxford University Press, 2000. ISBN 0194313697.
BC Evans, Virginia. CPE Use of English 1. Swansea: Express Publishing, 1998.