Prabook. Sitio web, 23 mayo 2018 : Richard Lippincott Williams (Editor, writer Richard Lippincott Williams, American writer, editor. Coined term Flying Fortress for B-17 bomber. Member Time-Life Alumni Association, Alpha Delta Sigma, Sigma Delta Chi, Tau Kappa Epsilon. Williams, Richard Lippincott was born on November 28, 1910 in Seattle, Washington, United States. Son of Charles Richard and Dolly DeMaris (White) Williams. Died November 5, 1989 (aged 78)) : https://goo.gl/rzGYwr

The Cascades, 1974: t.p. (Richard L. Williams)

LC in OCLC, 2/2/96 (hdg.: Williams, Richard Lippincott; usage: Richard L. Williams)

Biblioteca del Congreso (Estados Unidos), 23 mayo 2018 : catálogo electrónico: https://goo.gl/tm7GBS