Villagra, D. & Van Bogaert, N. & Ampe, B. & Walker, P. & Uhlmann, S.S. (2022)
Life-history traits of batoids (Superorder Batoidea) in the Northeast Atlantic and the Mediterranean. Reviews in Fish Biology and Fisheries, 32, 473–495
DOI: 10.1007/s11160-021-09695-3

Walker, P. & Kingma, I. (2013)
Onderzoek naar haaien en roggen in Nederland in het kader van de Kaderrichtlijn Mariene Strategie. Nederlandse Elasmobranchen Vereniging, Nr. 1300014070: 33pp

Walker, P. & Kingma, I. (2011)
Blueprint for Shark Survival [Abstract]. In Programme Booklet of The 15th Annual Scientific Conference of the European Elasmobranch Association, Berlin, 29.10.–30.10.2011

Ellis, J. & Walker, P. (2005)
Species accounts: Dipturus batis In Fowler, S.L., Cavanagh, R.D., Camhi, M., Burgess, G.H., Cailliet, G.M., Fordham, S.V., Simpfendorfer, C.A. and Musick, J.A.(comp. and Ed.). Sharks, Rays and Chimaeras: The Status of the Chondrichthyan Fishes. Status Survey. IUCN SSC Shark Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK: 333–335

Ellis, J. & Walker, P. & Dulvy, N.K. (2005)
Species accounts: Raja clavata In Fowler, S.L., Cavanagh, R.D., Camhi, M., Burgess, G.H., Cailliet, G.M., Fordham, S.V., Simpfendorfer, C.A. and Musick, J.A.(comp. and Ed.). Sharks, Rays and Chimaeras: The Status of the Chondrichthyan Fishes. Status Survey. IUCN SSC Shark Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK: 340–342

Cox, D.L. & Walker, P. & Koob, T.J. (1999)
Predation on eggs of the thorny skate. Transactions of the American Fisheries Society, 128(2), 380–384
DOI: 10.1577/1548-8659(1999)128<0380:POEOTT>2.0.CO;2

Walker, P. & Howlett, G. & Millner, R. & Van Leeuwen, P. & Daan, N. (1996)
The sensitive skate and fisheries - a North Sea perspective [Abstract]. American Elasmobranch Society 12th Annual Meeting, June 13–19,1996 New Orleans, Louisiana, U.S.A.