Frank Lloyd Wright Drawings: Masterworks fron the Frank Lloyd Wright Archives - Automobile Objective for Gordon Strong, project - FLLW Archive Drawing Number 2505.023: Perspective (p. 136)

Drawing Citation

Drawing 023 - Perspective (Probably the first study)
Automobile Objective for Gordon Strong, project (is cited in)
Frank Lloyd Wright Drawings: Masterworks fron the Frank Lloyd Wright Archives (published in)