Upchurch, P.; Andres, B.B.; Butler, R.J.; Barrett «An analysis of pterosaurian biogeography: implications for the evolutionary history and fossil record quality of the first flying vertebrates». Historical Biology, 27(6), 2015, pàg. 697–717. DOI: 10.1080/08912963.2014.939077. PMC: 4536946.
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Upchurch, P.; Andres, B.B.; Butler, R.J.; Barrett «An analysis of pterosaurian biogeography: implications for the evolutionary history and fossil record quality of the first flying vertebrates». Historical Biology, 27(6), 2015, pàg. 697–717. DOI: 10.1080/08912963.2014.939077. PMC: 4536946.