"Radio Conference Recommendations: New Wave Lengths", Radio Age, May 1923, page 11. Beginning with these assignments radio stations ended the practice of broadcasting their market reports and weather forecasts on the separate 485-meter wavelength.
"Class B Calls and Waves", Radio Age, June 1923, page 12. The listed wavelength of 492 meters corresponds to a frequency of 610 kHz.
"WFAN Begins 101.9 FM Simulcast Friday". Bob's Blitz. Retrieved October 30, 2012. CBS Radio merged with Entercom in 2017, Entercom is the current owner of WFAN.
"New stations: Special Land", April 1, 1922, page 6. The leading "2" in 2XY's call sign indicated that it was located in the second Radio Inspection district. The "X" signified that it was operating under an Experimental license.
"New stations", Radio Service Bulletin, May 1, 1922, page 4.
"New stations", Radio Service Bulletin, June 1, 1922, page 3.
Archer, Gleason (August 28, 1922). History of Radio to 1926. American Historical Society. pp. 397–399.
"Chronology of Milestones: Commercial Aspects", The first quarter-century of American Broadcasting by Edward P. J. Shurick, 1946, page 176. (This source incorrectly lists 2IA's call sign as "WAAT", which would not be used until the following April.)
