Nalyse the role of the Catholic Church and the Vatican during the Nazi Holocaust.

You can use either the Harvard system familiar to political scientists or the footnote system preferred by historians. If you use the latter please note the following. History references should be supplied as endnotes or footnotes. They should be full enough when first cited to be readily identifiable. Any further citation should be indicated by a clear abbreviation. Avoid art.cit., loc.cit. When a reference to a particular page or folio of a single work is followed in the next footnote by a reference to the same item, ibid. (not italics) may be used, but for the sake of clarity it should never be used after citations of more than one work. References to books should indicate author(s) by forename(s)/initial(s) and surname, title in italics (or underlined in typescripts), place of publication and date in round brackets separated by a comma, and, finally, page number(s). The name of the publisher should be included only if considered unusual, or significant in the context of the article. For archival sources list the details of the document (sender, recipient, date), then the details of the archive, and then archival document reference number.
Reading: A number of items in the bibliography deal with this topic but see the following in particular: Conway, Catholic Politics (for context & broad perspective, esp chpts 3 & 4); Deutsch, The conspiracy against Hitler in the twilight war (for a positive view of Pope Pius XII) Falconi, The Silence of Pius XII; Friedlander, Pius XII and the Third Reich; Hilberg, Perpetrators, victims, bystanders; Hochhuth, The Deputy (see the text of this important and controversial play and the section of the book entitled  Sidelights on History); Kent,  Pope Pius XII and Germany (AHR); Pope Pius XXII (video-recording; copy in Brunel Library); Lederhendler, Jews, Catholics, and the Burden of History (on Jewish-Catholic relations in historical context); Rhodes, The Vatican in the Age of the Dictators 1922-1945; Saperstein, Moments of Crisis in Jewish-Christian Relations (ch 4). Additionally, you should try JSTOR which should give you some other journal articles on this topic.