- The Natural Principles of Beauty: As Developed in the Human Figure - Primary Source Edition
- Proportion, or, The Geometric Principle of Beauty, Analysed
- The Geometric Beauty Of The Human Figure Defined: To Which Is Prefixed A System Of Æsthetic Proportion Applicable To Architecture And The Other Formative Arts
- Die Gesetze Der Farbenharmonie Vorz�glich F�r Die Zwecke Der Haus-, Studen- Und Decorationsmalerei
- A Catalogue Raisonne Of The Works Of D. R. Hay: With Critical Remarks By Various Authors