The Saturday Evening Post, January 17, 1920, cover illustration (©SEPS licensed by Curtis Licensing, Indianapolis, IN. All rights reserved)
Thomas Buechner, Norman Rockwell: Artist & Illustrator, New York, 1970, illustrated fig. 128, p. 80
Christopher Finch, Norman Rockwell's America, New York, 1975, illustrated pp. 75, 272 (as Love Letters)
Dr. Donald Stoltz and Marshall L. Stoltz, Norman Rockwell and ‘The Saturday Evening Post:’ May 1916-July 1928, vol. I, New York, 1976, p. 53, illustrated p. 54
Mary Moline, Norman Rockwell Encyclopedia, Indianapolis, Indiana, 1979, illustrated fig. I-135, p. 38 (as Pen Pals or Love Letters)
Laurie Norton Moffatt, Norman Rockwell: A Definitive Catalogue, vol. I, Stockbridge, Massachusetts, 1986, no. C215, p. 83, illustrated p. 82
Jan Cohn, Covers of “The Saturday Evening Post:" Seventy Years of Outstanding Illustration from America’s Favorite Magazine, New York, 1995, illustrated p. 96