Collins COBUILD Advanced Learner's Dictionary
Collins Cobuild Advanced Learner's Dictionary: The Source of Authentic English
English for IELTS Collins COBUILD Key Words for IELTS Book 3 Advanced IELTS 7+ (C1+)
COBUILD Advanced American English Dictionary 2nd edition
Collins COBUILD Intermediate Learner’s Dictionary
Collins Cobuild Primary Learner's Dictionary: Age 7+