(en) Board of Rapid Transit Railroad Commissioners, Report of the Board of Rapid Transit Railroad Commissioners for the City of New York For The Year Ending December 31, 1904 Accompanied By Reports of the Chief Engineer and of the Auditor, New York, Press of W. P. Mitchell & sons, coll. « americana », , 504 p. (lire en ligne), p. 229–236.
issn.org
portal.issn.org
(en) « Trains To Ship Canal — But They Whiz by Washington Heights Stations », The New York Times, , p. 16 (ISSN0362-4331, lire en ligne, consulté le ).
(en) « Express to 221st Street: Will Run In the Subway To-day–New 181st Street Station Ready », The New York Times, (ISSN0362-4331, lire en ligne, consulté le ).
nytimes.com
(en) « Trains To Ship Canal — But They Whiz by Washington Heights Stations », The New York Times, , p. 16 (ISSN0362-4331, lire en ligne, consulté le ).
(en) « Express to 221st Street: Will Run In the Subway To-day–New 181st Street Station Ready », The New York Times, (ISSN0362-4331, lire en ligne, consulté le ).