A Level Music: Harmony Workbook 2 - Revised Edition by Hugh Benham | Classroom Music Theory for A Level Students | Harmony and Counterpoint Study Guide with Practice Activities for UK Exam Boards
Chester's Easy-Peasy Theory Set 2 by Carol Barratt - Music Theory Workbook for Young Beginners Age 5+ | Graded Worksheets for Instrumental Lessons, Home Study and Music Education with Reward Stickers