In print
Close is featured in an extensive interview in Something Wonderful Right Away, a book about the members of the Compass Players and Second City written by Jeffrey Sweet. Originally published in 1978 by Avon, it is currently available from Limelight Editions.
From 1984 to 1988, Del Close wrote comic book stories in First Comics' Grimjack. With regular writer John Ostrander, Close co-wrote Munden's Bar stories in Grimjack issues #3, 4, 8, 10, 17, 22, 25, 28, 35, and 42. (Close knew Ostrander from the Chicago theater scene.) From 1987 to 1989, also with Ostrander, Close wrote anthology-style horror stories in the DC Comics title Wasteland. Several of the stories are allegedly autobiographical; one recounts Close's experiences while filming Beware! The Blob (1972), and another recalls an encounter with writer L. Ron Hubbard, author of horror and science fiction, and founder of Scientology. Eric Spitznagel wrote about when he heard Close recount his alleged meeting with L.Ron Hubbard, in which Close claimed to have suggested to Hubbard, "Well, if you're worried about taxes, you should just turn Scientology into a religion" (an anecdote that Spitznagel claimed many others have heard Close recount also). In the 2020 documentary, For Madmen Only: The Stories of Del Close, one of the interviewees, Charna Halpern, recounts that she had heard Close say the same anecdote about himself and Hubbard. There have been a number of different individuals that have claimed for themselves, or been attributed with, giving Hubbard the suggestion of turning Scientology into a religion in order to make a lot of money.
In 2004, writer/comedian R. O'Donnell wrote "My Summer With Del" for Stop Smiling magazine #17 Comedian Issue. The feature was an account of O'Donnell's visits at Del's Chicago apartment as well as recounting highlights of their time spent at CrossCurrents, the theater that housed both their comedy groups.
In 2005, Jeff Griggs published Guru: My Days with Del Close, detailing their friendship during the last two years of Close's life. Due to Close's poor health (in part caused by long-term alcohol and drug use), Halpern suggested that Griggs run errands with Close. Guru gives a particularly detailed and complete picture of Close based on those shared hours. At the beginning of their relationship, Griggs was a student of Del's, and the book includes several chapters in which Griggs depicts Close as a teacher. Griggs also wrote that as Close's reputation grew, improv clubs around the country invited him to teach, and that some of those visits developed into weeklong festivals, including Austin's Big Stinkin' Improv Festival, which Griggs described as "the biggest of the bunch". The book has been adapted into a screenplay, and as of 2006 Harold Ramis was attached to direct the script. Ramis (who died in 2014) wanted Bill Murray to play Close.
Close co-authored the 1994 book Truth in Comedy: The Manual of Improvisation with Charna Halpern and Kim "Howard" Johnson; the book outlines techniques now common in longform improvisation and describes the overall structure of "Harold", which remains a common frame for longer improvisational scenes.
In 2007, Eric Spitznagel wrote an article in the September issue of The Believer magazine reflecting on Close's life and his propensity for storytelling.
In 2008, Kim "Howard" Johnson published The Funniest One in the Room: The Lives and Legends of Del Close, a full-length biography. Johnson himself was a student of Close; the two remained friends until Close's death.
In 2022, Bob Odenkirk wrote a memoir Comedy, Comedy, Comedy, Drama, which includes excerpts of an interview with Del Close who was influential in the startup of his career.