Roberts, C. (2020). Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal eclecticism, pastoral implications. International Marian Research Institute.
Lua i Stíl Chicago (17ú heag.)Roberts, Christopher. Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal Eclecticism, Pastoral Implications. Dayton, Ohio: International Marian Research Institute, 2020.
Lua MLA (8ú heag.)Roberts, Christopher. Ullathorne's The Immaculate Conception of the Mother of God (1904): Doctrinal Eclecticism, Pastoral Implications. International Marian Research Institute, 2020.
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