Catholic Pentecostalism : Problems in Evaluation
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"The author bases his observations [of Catholic Pentecostalism] on four years of research.[...]The method used in research was that of participatory observation. Therefore the conclusions are based not only on printed documents, which in Pentecostalism are often misleading, but on extensive field research.[...] The chief concern here is to show why an objective evaluation of Pentecostalism within Catholicism is difficult."
McDonnell, Kilian. Catholic Pentecostalism: Problems in Evaluation. Pecos, N.M.: Dove Pub, 1970.