APA-Zitierstil (7. Ausg.)
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.
Chicago-Zitierstil (17. Ausg.)
ebrary, Inc, und 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.
MLA-Zitierstil (9. Ausg.)
ebrary, Inc, und John F. Wippel. The Ultimate Why Question: Why Is There Anything at All Rather than Nothing Whatsoever? Catholic University of America Press, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.