Clack, Jennifer A (2012) "From fins to feet" Chapter 6, pages 187–260, in:Gaining Ground, Second Edition: The Origin and Evolution of Tetrapods, Indiana University Press. ISBN9780253356758.
Zamparo P, Pendergast DR, Termin A, Minetti AE (March 2006). "Economy and efficiency of swimming at the surface with fins of different size and stiffness". Eur. J. Appl. Physiol. 96 (4): 459–70. doi:10.1007/s00421-005-0075-7. PMID16341874. S2CID34505861.
Zamparo P, Pendergast DR, Termin A, Minetti AE (March 2006). "Economy and efficiency of swimming at the surface with fins of different size and stiffness". Eur. J. Appl. Physiol. 96 (4): 459–70. doi:10.1007/s00421-005-0075-7. PMID16341874. S2CID34505861.
Zamparo P, Pendergast DR, Termin A, Minetti AE (March 2006). "Economy and efficiency of swimming at the surface with fins of different size and stiffness". Eur. J. Appl. Physiol. 96 (4): 459–70. doi:10.1007/s00421-005-0075-7. PMID16341874. S2CID34505861.