English C1 Level

Next Level English C1 Advanced: 50 lessons to improve your English conversation: Real-world vocabulary and grammar for speaking success (English Edition)

Future House Languages

Activate Advanced C1 - A Complete Self-Study Course: Improve your English level in all the skills and pass your Cambridge C1, IELTS, Trinity or TOEFL exam. (Activate Your English™) (English Edition)

Independently published

50 Engaging C1 Level Vocabulary Short Stories for Advanced English Learners

Cambridge University Press

English Unlimited. Level C1 Self-study Pack      

50 Hilarious Short Stories for English C1 Level Learners: Laugh Your Way to Mastery (English Edition)

La Biblia del Use of English - C1 LEVEL: 10 Practice Tests + Guía de Estudio (Spanish Edition)

“Skill Booster - 10 Examination Papers for B2-C1 levels” (English Edition)

Independently published

La Biblia del Use of English - B2 + C1 LEVEL: 20 Practice Tests + Guía de Estudio

GRAMMATICHE

Building Blocks. Basics of English for Communication. Level B1-C1 [Lingua inglese]

Cambridge University Press

English Unlimited. Level C1.