Condit, Carl W. (1973). 《Chicago 1910–29, Building, Planning, and Urban Technology》. The University of Chicago Press. 273, 279, 297쪽. ISBN0-226-11456-2. LCCN72-94791.
planning.org
“2012 Great Public Spaces”. 《Great Places in America: Public Spaces》. American Planning Association. 2013년 2월 11일에 확인함.