Gettings Michael (1999). "Gödel's ontological argument: a reply to Oppy". Analysis. 59 (264): 309–313. doi:10.1111/1467-8284.00184.
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André Fuhrmann (2005). "Existenz und Notwendigkeit — Kurt Gödels axiomatische Theologie" [Existence and Necessity — Kurt Gödel's Axiomatic Theology] (PDF). In W. Spohn (ed.). Logik in der Philosophie [Logic in Philosophy] (in German). Heidelberg: Synchron. pp. 349–374. Archived(PDF) from the original on 2016-05-18.
Gödel's proof is reprinted on p.403-404,429-437 of: Kurt Gödel (Mar 1995). Solomon Feferman and John W. Dawson jr. and Warren Goldfarb and Charles Parsons and Robert M. Solovay (ed.). Unpublished Essays and Lectures(PDF). Collected Works. Vol. III (1st ed.). Oxford: Oxford University Press. ISBN0-19-507255-3.
Kurt Gödel (Mar 1995). "Texts Relating to the Ontological Proof (App. B)". In Solomon Feferman; John W. Dawson jr.; Warren Goldfarb; Charles Parsons; Robert M. Solovay (eds.). Unpublished Essays and Lectures(PDF). Collected Works. Vol. III (1st ed.). Oxford: Oxford University Press. pp. 429–437. ISBN0-19-507255-3. Here: p.435; probably, Sobel referred to Gödel's note 4.: "... If is assumed [as following from the essence of ], ... but that is the inferior way. Rather, should follow first from the existence of God." The note might indicate that Gödel was aware of his axioms implying modal collapse.
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Curtis Anthony Anderson and Michael Gettings (Aug 1996). "Gödel's ontological proof revisited". In Petr Hájek (ed.). Proc. Gödel '96: Logical Foundations of Mathematics, Computer Science and Physics — Kurt Gödel's Legacy. Lecture Notes in Logic. Vol. 6. Springer. pp. 167–172.
André Fuhrmann (2005). "Existenz und Notwendigkeit — Kurt Gödels axiomatische Theologie" [Existence and Necessity — Kurt Gödel's Axiomatic Theology] (PDF). In W. Spohn (ed.). Logik in der Philosophie [Logic in Philosophy] (in German). Heidelberg: Synchron. pp. 349–374. Archived(PDF) from the original on 2016-05-18.