Lebl, J. (2019a) Basic Analysis: Introduction to Real Analysis Volume I. Version 5.2. Available at: http://www.jirka.org/ra/realanal.pdf.
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Spivak, M. (2008) Calculus. 4th ed. Houston, Tex: Publish or Perish.
Stewart, J. (2016) Calculus: metric version. Eighth edition. Australia: Cengage Learning. Available at: https://ebookcentral-proquest-com.ezproxy.library.uq.edu.au/lib/uql/detail.action?docID=6161472.