The best replacement for footnotes is bibliography.

The best alternatives to footnotes are rated as following:
★★★★★  bibliography
★★★★  endnotes
★★★  citations
★★  in text citations
★★  works cited
★  references
★  parenthetical citations
  parenthetical citation
  parenthetical
  bibliography chicago
  in-text citations
  harvard referencing
  in text
  footnotes
  mla
  endnote

Your alternative for footnotes is not listed? Suggest!
Speaking about footnotes, one probably shouldn't forget about same source.

Other search terms related to footnotes and their ratings are:
★★★★★ same source
★★★★ chicago style
★★★★ ibid
★★ apa
★★ bibliography
★★ quotation marks
★★ mla
★★ markdown
mla format
harvard referencing
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footnotes
bibliography
endnotes