by van Strien, A.J., Pannekoek, J., Gibbons, D.W.
Published in Bird study (01.07.2001)

by Sim, I.M.W., Gibbons, D.W., Bainbridge, I.P., Mattingley, W.A.
Published in Bird study (01.11.2001)

by Wilkinson, N.I., Langston, R.H.W., Gregory, R.D., Gibbons, D.W., Marquiss, M.
Published in Bird study (01.07.2002)

by Green, R.E., Gibbons, D.W.
Published in Bird study (01.07.2000)

by Wotton, S.R., Langston, R.H.W., Gibbons, D.W., Pierce, A.J.
Published in Bird study (01.07.2000)

by Hancock, M.H., Gibbons, D.W., Thompson, P.S.
Published in Bird study (01.11.1997)

by Gibbons, D.W., Bainbridge, I.P., Mudge, G.P., Tharme, A.P., Ellis, P.M.
Published in Bird study (01.07.1997)