^The encyclopedia of Christianity, Volume 3 by Erwin Fahlbusch, Geoffrey William Bromiley 2003 ISBN9004126546 pp. 403–404.
^Rahner, Karl 2004 Encyclopedia of theology: a concise Sacramentum mundiISBN0860120066 p. 901.
^Hillerbrand, Hans Joachim. Encyclopedia of Protestantism, Volume 3 2003. ISBN0415924723 p. 1174.
^Encyclopedia of Social History (ISBN0815303424 p. 573) states: "More broadly defined, Mariology is the study of devotion to and thinking about Mary throughout the history of Christianity."