Once you have created a footnote or endnote in OpenOffice.org Writer, 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 OpenOffice.org Writer 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.
The EndNote style that is selected when you choose Format Bibliography 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.
If you are citing full references in footnotes, you can include specific page numbers to be formatted like a regular EndNote field. See Customizing Individual Citations. Or, if you are manually typing citations, see Citing Specific Page Numbers in Footnotes.