Parenthetical referencing can be used in lieu of footnote citations (the Vancouver system). Modified text is in italics with reasons for such modification in a footnote. Additional scriptures were introduced and footnote references were increased. F = omission noted in the footnote. The main story and the poem summarized in the footnote share a theme. There is some relevant discussion in this footnote. Pius X cites Alexander VII's bull in his footnote 11. A summary of Collin's description is in a footnote. A revision in 2007 comprised mostly minor textual or footnote changes. The correct interpretation of Mill's footnote is a matter of some debate. The footnote on this statement is to Msgr. Roddy mentioned "The Pilgrim" in a footnote to his article. NASA has guidance for footnote usage in its historical documents. Minor historical footnote&colon; Stewart also suggested the name Twiddly. So, is transcribed , as is and ; the numbered footnote in is written .