Ryan's profitable leadership of P.F. Collier & Son supplied the cash flow that kept its parent company, The Crowell-Collier Publishing Company (later renamed Macmillan, Inc), solvent in the 1950s as it closed its money-losing magazines, including Collier's,[9][10] and grew into one of the world's largest book publishers.[11][12] At P.F. Collier & Son, he employed the conservative intellectual William Terry Couch as editor of Collier’s Encyclopedia and instructed Couch to begin compilation of what became Collier’s Encyclopedia’s 24-volume 1962 edition.[13][14] At Grolier, publishers of Encyclopedia Americana, he built The Richards Company, Inc., into Grolier's highest sales volume book division.[15] Ryan also pioneered the sale of American encyclopedias in overseas markets.[16]
^Kaslow, Joseph (December 29, 1955). "Named by Collier". New York Herald Tribune. p. A7.
^The Record, Hackensack, New Jersey, Feb 05, 1989 · Page 35
^Encyclopaedia Britannica ends print run, Robert Channick, L.A. TIMES ARCHIVES, 14 Mar 2012, Los Angeles Times (latimes.com)
^"300 Millionth Book". The Morning Call. March 31, 1957. p. 39.
^Shiflett, Orvin Lee (2013). William Terry Couch and the Politics of Academic Publishing: An Editor's Career as Lightning Rod for Controversy. Jefferson, North Carolina: McFarland and Company. p. 147. ISBN978-0786499816.
^P.F. Collier Associates (1958). Twenty Five Eventful Years in the History of P.F. Collier Corporation, 1933-1958. New York, New York: P.F. Collier and Son Corporation.
^"CE Acceptance By Libraries Is Sales Aid,” Collier’s Cyclorama, Vol 2. No 4., P.F. Collier and Son Corporation, New York NY, July 1957. Page 2
^“Collier Book Output Passes 200 Millions,” Collier’s Cyclorama, Vol 1. No 2., P.F. Collier and Son Corporation, New York NY, March 1956. Page 1
^Publisher Eyes Dividends in ‘58” The Bridgeport Telegram, Bridgeport, Connecticut, 17 Jul 1957, Page 32. Retrieved 11 Jun 2021
^Colliers, ‘Companion” to stop publishing in Jan.". Star-Gazette (Elmira, New York) 15 Dec 1956, Sat Page 2. Retrieved 2021-05-03.
^Crowell Collier to Absorb Macmillan Publishing Firm” The Miami Herald, Miami, Florida, 30 Jun 1960, Page 44. Retrieved 11 Jun 2021.
^“Crowell Collier is Buying Control of Macmillan,” The New York Times, New York, NY. 30 Jun 1960, Page 27. Retrieved 11 Jun 2021
^Orvin Lee Shiflett William Terry Couch and the Politics of Academic Publishing: An Editor's Career as Lightning Rod for Controversy (Jefferson, North Carolina): McFarland and Company, Inc. 2013) Page154.
^“New Collier’s Encyclopedia Has Astronaut Glenn’s Orbital Flight.” Lexington Herald-Leader (Lexington, Kentucky) 10 Jun 1962, Page 65. Retrieved 11 Jun 2021