Books of The Times
https://archive.nytimes.com/www.nytimes.com/books/98/02/15/home/heller-catch.html?_r=1
New York Times review of Catch-22 at its initial release in 1961.
Cath-22 Plus: A Conversation With Joseph Heller
https://archive.nytimes.com/www.nytimes.com/books/98/02/15/home/heller-conversation.html?_r=2
New York Times interview with Heller, held in 1994.
Joseph Heller, The Art of Fiction No. 51
https://www.theparisreview.org/interviews/3894/the-art-of-fiction-no-51-joseph-heller
From 1974, The Paris Review's exploration of Heller's writing process.