Richard J. Butler; Stephen L. Brusatte; Brian B. Andres; Roger B. J. Benson (2012). How do geological sampling biases affect studies of morphological evolution in deep time? A case study of the Pterosauria (Reptilia: Archosauria). Evolution. 66 (1): 147—162. doi:10.1111/j.1558-5646.2011.01415.x. PMID22220871.
Richard J. Butler; Stephen L. Brusatte; Brian B. Andres; Roger B. J. Benson (2012). How do geological sampling biases affect studies of morphological evolution in deep time? A case study of the Pterosauria (Reptilia: Archosauria). Evolution. 66 (1): 147—162. doi:10.1111/j.1558-5646.2011.01415.x. PMID22220871.