^Donald E. Thompson, ed. (1974), Indiana Authors and their Books, 1917-1966 (بالإنجليزية), Wabash College, OCLC:929100, QID:Q117272481
^Cox، William (8 فبراير 2006). "Record Unit 7188 Oliver Perry Hay Papers,1911-1930". Finding Aids to Personal Papers and Special Collections in the Smithsonian Institution Archives. Smithsonian Institution. مؤرشف من الأصل(web) في 2011-07-25. اطلع عليه بتاريخ 2008-01-14.