Lindgren, Henry Clay, 1914-2005 (Nombre personal)

His The art of human relations, 1953.

SFGate, viewed online March 6, 2019: obituary published June 20, 2005 (Henry Clay Lindgren, emeritus professor of psychology at San Francisco State University and a renowned collector of rare coins, died June 12 at his home in San Francisco. He was 91.)