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Edwin F. Taylor and John Archibald Wheeler, Spacetime Physics, second edition, W. H. Freeman, New York, 1992.

Tevian Dray, The Geometry of Special Relativity, Course notes, Oregon State University, 2003.

Tevian Dray, The Geometry of Special Relativity, http://physics.oregonstate.edu/coursewikis/GSR, 2010.

Tevian Dray, The Geometry of Special Relativity, Physics Teacher (India) 46, 144–150 (2004).

David J. Griffiths, Introduction to Electrodynamics, 3rd edition, Prentice Hall, Upper Saddle River, 1999.

Tevian Dray and Corinne A. Manogue, The Geometry of the Dot and Cross Products, JOMA 6, June 2006, http://www.joma.org/?pa=content&sa=viewDocument&nodeId=1156.

Tevian Dray, The Twin Paradox Revisited, Am. J. Phys. 58, 822–825 (1990).

Ray A. d'Inverno, Introducing Einstein's Relativity, Oxford University Press, Oxford, 1992.

Edwin F. Taylor, John Archibald Wheeler, Exploring Black Holes: Introduction to General Relativity, Addison-Wesley, San Francisco, 2000.

Tevian Dray, Using differentials to differentiate trigonometric and exponential functions, College Math. J. (2013; to appear), http://www.math.oregonstate.edu/bridge/papers/trig.pdf.