An introduction to the Heisenberg group and the sub-Riemannian isoperimetric problem with L. Capogna, D. Danielli, and S.D. Pauls, Progress in Mathematics, vol. 259, Birkhauser, 2007.

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• Conformal Dimension: Theory and Application, John M. Mackay and Jeremy T. Tyson, University Lecture Series, vol. 54, © American Mathematical Society, 2010.
• Please see also the List of errata.

• Sobolev spaces on metric measure spaces: an approach based on upper gradients, Juha Heinonen, Pekka Koskela, Nageswari Shanmugalingam, and Jeremy T. Tyson, New Mathematical Monographs, vol. 27, © Cambridge University Press, 2015.