1. Bird Surveys;Bibby,1998
2. Bird Census Techniques;Bibby,2000
3. Seasonal changes in habitat use of resident passerines;Bilcke;Ardea,1984
4. The Relascope Idea. Relative Measurements in Forestry;Bitterlich,1984
5. The ecology and conservation of the Marsh Tit in Britain;Broughton;British Birds,2015