^Esso (1954). New York with Special Maps of Putnam–Rockland–Westchester Counties and Finger Lakes Region (Map). Cartography by General Drafting (1955–56 ed.).
^ abDickinson, Leon A. (January 12, 1930). "New Signs for State Highways". The New York Times: p. 136.
^Automobile Legal Association (ALA) Automobile Green Book, 1930–31 and 1931–32 editions, (Scarborough Motor Guide Co., Boston, 1930 and 1931). The 1930–31 edition shows New York state routes prior to the 1930 renumbering