DeLio has also written books, including one analyzing the work of Morton Feldman ("The Music of Morton Feldman") and another offering analysis of several “open form” works ("Circumscribing the Open Universe"). His book "The Amores of John Cage" was published by Pendragon Press (as part of the College Music Society series Sourcebooks in American Music) in 2010. A book about DeLio's work entitled "Thomas DeLio: Composer and Scholar" edited by Dr. Thomas Licata (Professor, Hartwick College) appeared in summer of 2007 from the Mellen Press. This book contains essays by Wesley Fuller (Professor Emeritus, Clark University), Agostino Di Scipio (Professor, University of Naples, Italy), Christopher Shultis (Regents Professor, University of New Mexico), Hermann Sabbe (Professor of Musicology, Ghent University, Belgium), Morris Palter (University of California, San Diego), Steven Johnson (Professor, Brigham Young University), Robert Morris (Professor, Eastman School of Music), Tracy Wiggins (University of North Carolina at Pembroke), Linda Dusman, Thomas Goldstein (Professors, University of Maryland, Baltimore County) and Michael Boyd (Chatham University) .