Higdon, H. The Crime of the Century (1975). New York: Putnams. ASINB000LZX0RO pp. 281–317.
Leopold, Nathan Jr. (1963). Checklist of Birds of Puerto Rico and the Virgin Islands. University of Puerto Rico Agricultural Experiment Station. ASINB006D31YB2.
Butler, Robert (2005). "The Loeb and Leopold Case: A Neglected Source for Richard Wright's "Native Son"". African American Review. 39 (4): 555–567. ISSN1062-4783. JSTOR40033693.
Butler, Robert (2005). "The Loeb and Leopold Case: A Neglected Source for Richard Wright's "Native Son"". African American Review. 39 (4): 555–567. ISSN1062-4783. JSTOR40033693.