Selected references:

Besbeas, P., Freeman, S.N., Morgan, B.J.T. & Catchpole, E.A. (2002) Integrating mark–recapture–recovery and census data to estimate animal abundance and demographic parameters. Biometrics 58: 540–547.

Burton, J.F. 1956. Report on the national census of heronries, 1954. Bird Study 3: 42–73.

Marchant, J.H., Freeman, S.N., Crick, H.Q.P. & Beaven, L.P. (2004) The BTO Heronries Census of England and Wales 1928–2000: new indices and a comparison of analytical methods. Ibis 146: 323–334.

Marquiss, M. 1989. Grey Herons Ardea cinerea breeding in Scotland: numbers, distribution and census techniques. Bird Study 36: 181–191.

Nicholson, E.M. 1929. Report on the 'British Birds' census of heronries, 1928. British Birds 22: 270–323, 334–372.

Stafford, J. 1979. The national census of heronries in England and Wales in 1964. Bird Study 26: 3–6.

Wells, J.H. 1978. Results of a census of Northern Ireland heronries in 1977. Irish Birds 1: 187–198.

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