Atkinson, P.W., Baker, A.J., Bennett, K.A., Clark, N.A., Clark, J.A., Cole, K.B., Dey, A., Duiven, A.G., Gillings, S., Gonzalez, P.M., Harrington, B.A., Kalasz, K., Minton, C.D.T., Newton, J., Niles, L.J., Robinson, R.A., de Lima Serrano, I. & Sitters, H.P. 2006. Using stable isotope ratios to unravel shorebird migration and population mixing: a case study with the Red Knot Calidris canutus. The Stationery Office, Edinburgh