*{{cite ref-web|lastcognom=Shottenkirk|firstnom=Dena|datedata= 16 Maymaig 2006|titletítol=Klee in America|publishereditor=artnet.com|url=http://www.artnet.de/magazine/klee-in-america/|accessdateconsulta= 14 Augustagost 2011}}
*{{cite bookref-llibre|lastcognom=Perl|firstnom=Jed|titletítol=New Art City: Manhattan at Mid-Century|datedata= 13 Februaryfebrer 2007|publishereditorial=Random House Digital, Inc.|isbn=978-1-4000-3465-9}}
*{{cite bookref-llibre|lastcognom=Danto|firstnom=Arthur Coleman|authorlinkenllaçautor=Arthur Coleman Danto|titletítol=Encounters & Reflections: Art in the Historical Present|yearany=1997|publishereditorial=University of California Press|isbn=978-0-520-20846-9}}