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2. Bauer, W. & M. Hodge, 1970. 1. Nachtrag zum ‘Catalogua Faunae Graeciae; Pars Ayes’. Vogelwelt 91: 96–106.
3. Bell, B. D., C. K. Catchpole & K. J. Corbett, 1968. Problems of censusing Reed Buntings, Sedge Warblers & Reed Warblers. Bird Study 15: 16–21.
4. Bell, B. D., C. K. Catchpole, K. J. Corbett & R. J. Hornby, 1973. The relationship between census results and breeding populations of some marshland passerines. Bird Study 20: 127–140.
5. Bibby, C. J., 1978. A heathland Bird Census. Bird Study 25: 87–96.