APA (7 ম সংস্করণ) উদ্ধৃতি

ebrary, Inc, & Wippel, J. F. (2011). The ultimate why question: Why is there anything at all rather than nothing whatsoever? Catholic University of America Press.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

ebrary, Inc, এবং John F. Wippel. The Ultimate Why Question: Why Is There Anything at All Rather than Nothing Whatsoever? Washington, D.C.: Catholic University of America Press, 2011.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

ebrary, Inc, এবং John F. Wippel. The Ultimate Why Question: Why Is There Anything at All Rather than Nothing Whatsoever? Catholic University of America Press, 2011.