Once you have created a footnote or endnote in Pages, you can cite references in that footnote or endnote just like you cite them in the body of the document.
To cite a reference in a footnote or endnote:
Use the appropriate command in Pages to create the footnote or endnote. (EndNote does not create the footnote or endnote in the document, but is used to insert and format citations in the note.)
Position the cursor in the footnote or endnote where you would like the citation(s) to appear.
Insert the citation as you normally would. See Finding and Inserting Citations.
The current EndNote style that is selected determines how citations in footnotes and endnotes are formatted. EndNote can format these citations as brief in-text citations or like complete references in the bibliography. It can also create a special format specific to footnotes or endnotes, including options like “Ibid.” and other variations of shortened references when a citation appears more than once in the footnotes or endnotes. See Bibliography and Footnote Templates.