The quotations at the beginning of each page of this site are all from the wonderful book Greenwich Village by Anna Alice Chapin (Dodd, Mead and Company, Inc., 1917). I also have these books to thank for information:
Around Washington Square: An Illustrated History of Greenwich Village by Luther S. Harris (Baltimore: The Johns Hopkins University Press, 2003)
Inside Greenwich Village: A New York City Neighborhood, 1898-1918 by Gerald W. McFarland (Amherst: University of Massachusetts Press, 2001)