Janey Levy 
Architecture of Frank Lloyd Wright [PDF ebook] 
Understanding the Concepts of Parallel and Perpendicular

This book provides students with a foundational and concise history of architecture and goes on to highlight the concepts of parallel and perpendicular through focusing on the style of Frank Lloyd Wright. Includes comparative models of architecture, a breakdown of Wright’s houses with illustrative, geometrical line drawings, and a discussion of the famous Fallingwater house.