Johrendt, Jochen (2012). "The Empire and the Schism". In Duggan, Anne J.; Clarke, Peter D. (eds.). Pope Alexander III (1159–81): The Art of Survival. Routledge. p. 122. ISBN9781317078371.
Estonian Theological Society in Exile (April 1956). "Charisteria Iohanni Kõpp octogenario oblata. 304 pp. Stockholm, 1954. $5.00. (Papers of the Estonian Theological Society in Exile, No. 7.) (May be obtained from the Bookstore, Chicago Lutheran Theological Seminary, Maywood, Ill.)". Theology Today. 13 (1): 129. doi:10.1177/004057365601300124. ISSN0040-5736. S2CID220990258.
semanticscholar.org
api.semanticscholar.org
Estonian Theological Society in Exile (April 1956). "Charisteria Iohanni Kõpp octogenario oblata. 304 pp. Stockholm, 1954. $5.00. (Papers of the Estonian Theological Society in Exile, No. 7.) (May be obtained from the Bookstore, Chicago Lutheran Theological Seminary, Maywood, Ill.)". Theology Today. 13 (1): 129. doi:10.1177/004057365601300124. ISSN0040-5736. S2CID220990258.
worldcat.org
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Estonian Theological Society in Exile (April 1956). "Charisteria Iohanni Kõpp octogenario oblata. 304 pp. Stockholm, 1954. $5.00. (Papers of the Estonian Theological Society in Exile, No. 7.) (May be obtained from the Bookstore, Chicago Lutheran Theological Seminary, Maywood, Ill.)". Theology Today. 13 (1): 129. doi:10.1177/004057365601300124. ISSN0040-5736. S2CID220990258.