Color Psychology: Faber Birrens

Interaction of Color: Joseph Albers

The Art of Color: Johannes Itten

Perception and Imaging: Richard D. Zakia

Daybooks of Edward Weston,vol I,II,III: Edward Weston

Exploration of Color: Robert Hirsch

The Book of Alternative Processes: Christopher James

Photographic Possibilities: Robert Hirsch

Quiet Light:  John Sexton

Listen to the Trees: John Sexton

Places of Power: John Sexton

Explorations: Ray McSavaney

History of Photography: Helmut Gernsheim