"MTA Neighborhood Maps: 18 St (1)"(PDF). mta.info. Metropolitan Transportation Authority. 2018. Archived(PDF) from the original on July 4, 2018. Retrieved September 13, 2018.
"7th Avenue Subway System Is Opened To Public To-day: First Train Will Start at 2 O'Clock This Afternoon". New-York Tribune. July 1, 1918. p. 9. ProQuest575909557.
"Transit Unification Completed As City Takes Over I. R. T. Lines: Systems Come Under Single Control After Efforts Begun in 1921; Mayor Is Jubilant at City Hall Ceremony Recalling 1904 Celebration". New York Herald Tribune. June 13, 1940. p. 25. ProQuest1248134780.
"MTA Neighborhood Maps: 18 St (1)"(PDF). mta.info. Metropolitan Transportation Authority. 2018. Archived(PDF) from the original on July 4, 2018. Retrieved September 13, 2018.