Kurt Rudolph, "Baetke, Walter Hugo Hermann", Internationales Germanistenlexikon: 1800-1950, ed. Christoph König, Birgit Wägenbaur, et al., Berlin: de Gruyter, 2003, ISBN3-11-015485-4, Volume 1, pp. 75-77, p. 75(in German)
Fritz Heinrich, "Bernhard Kummer (1897–1962): The Study of Religions Between Religious Devotion for the Ancient Germans, Political Agitation, and Academic Habitus", The Study of Religion under the Impact of Fascism, ed. Horst Junginger, Numen Book Series (ISSN0169-8834): Studies in the History of Religions 117, Leiden/Boston: Brill, 2008, ISBN978-90-04-16326-3, p. 233. Also p. 244, note 65, quoting Baetke on Kummer: "Nun ist ja klar, daß diese 'Vergeistigung' germanischer Religion mit wissenschaftlicher Interpretation nichts mehr zu tun hat." - "Now it is quite clear that this 'spiritualisation' of Germanic religion no longer has anything to do with scholarly interpretation".
Gregory D. Alles, ed., Rudolf Otto, Autobiographical and Social Essays, History of Religions in Translation 2, Berlin/New York: Mouton De Gruyter, 1996, ISBN3-11-014519-7, Introduction, p. 34.
Todd A. Gooch, The Numinous and Modernity: an Interpretation of Rudolf Otto's Philosophy of Religion, Berlin/New York: de Gruyter, 2000, ISBN3-11-016799-9, p. 3.
Olof Sundqvist, "Aspects of rulership ideology in Early Scandinavia - with particular references to the skaldic poem Ynglingatal", Das Frühmittelalterliche Königtum: ideelle und religiöse Grundlagen, Ed. Franz-Reiner Erkens, Ergänzungsband zum Reallexikon der germanischen Altertumskunde 49, Berlin: de Gruyter, 2005, ISBN3-11-018886-4, pp. 87-124, p. 120.
Francis Oakley, Empty Bottles of Gentilism: Kingship and the Divine in Late Antiquity and the Early Middle Ages (to 1050), New Haven: Yale University, 2010, ISBN978-0-300-15538-9, p. 146.
According to Lee M. Hollander's review, he "knocks out the props from under" it "with sober and competent scholarship". Speculum 42.3 (1967) 511-513, p. 511.
Bernard Mees, "Charisma, Authority and Heil: Walter Baetke and the Chasm of 1945", paper presented at Nordic Ideology between Religion and Scholarship, Uppsala 23–25 August 2010: Summary p. 6 (pdf).
Fritz Heinrich, "Bernhard Kummer (1897–1962): The Study of Religions Between Religious Devotion for the Ancient Germans, Political Agitation, and Academic Habitus", The Study of Religion under the Impact of Fascism, ed. Horst Junginger, Numen Book Series (ISSN0169-8834): Studies in the History of Religions 117, Leiden/Boston: Brill, 2008, ISBN978-90-04-16326-3, p. 233. Also p. 244, note 65, quoting Baetke on Kummer: "Nun ist ja klar, daß diese 'Vergeistigung' germanischer Religion mit wissenschaftlicher Interpretation nichts mehr zu tun hat." - "Now it is quite clear that this 'spiritualisation' of Germanic religion no longer has anything to do with scholarly interpretation".