*[http://www.nypl.org/sites/default/files/archivalcollections/pdf/muscowel.pdf Henry Cowell Papers, 1851-1994] Music Division, New York Public Library for the Performing Arts.
*[http://www.nypl.org/ead/3351 Henry Cowell Collection of Noncommercial Recordings, 1940-1953] Rodgers and Hammerstein Archives of Recorded Sound, New York Public Library for the Performing Arts.
http://catalog.loc.gov/cgi-bin/Pwebrecon.cgi?Search%5FArg=Cowell%2C%20Henry&Search%5FCode=NAME%5F&CNT=25&PID=3249&BROWSE=1&HC=485&SID=1 Henry Cowell collection] at [[Library of Congress]]
*[http://www.schoenberg.at/1_as/schueler/berlin/Cowell_e.htm Berlin Students: Henry Cowell] lista delle opere
*[https://web.archive.org/web/20051118173455/http://www.newalbion.com/NA122/ Drums Along the Pacific] sull'associazione tra Cowell e Harrison (e Cage)