Fletcher, Robert. Defective colour vision : fundamentals, diagnosis, and management / Robert Fletcher, Janet Voke. - Bristol ; Boston : A. Hilger, c1985. - xi, 608 p. ISBN: 0852743955 Subjects--Topical Terms: Color blindness. LC Class. No.: RE921 / .F56 1985 Dewey Class. No.: 617.7/59�19