All sources of information such as quotes or borrowed ideas must be acknowledged in your essay.
In the Oxford style, a superscript number is inserted at the point in your essay where you cite another author's work. At the bottom of the same page repeat the superscript number then follow it with the full details, including the page number, of the author's work you are citing, see example below. Start your footnote numbering at 1 and continue the sequence throughout your essay. Note the line at the bottom of the page that separates the text of your essay from the footnotes.
[Please Note: It is now not common practice to use Latin abbreviations such as ibid. and op. cit. in Oxford. If you are frequently citing a particular work in your essay, give the full details of the work in your first footnote and then in subsequent footnotes for this work use the shortened format of: author surname, abbreviated title (i.e. no subtitle), and the page number. See footnotes 3 and 4 in the example above for the shortened footnote format. Always include the full details of the work in your Reference List.]