LITERATURE
- GIBB , J. A. 1960 . Populations of Tits and Goldcrests and their food supply in pine plantations. . Ibis. , 102 : 163 – 208 .
- KLUYVER , H. N. 1951 . The population ecology of the Great Tit, Parus m. major L. . Ardea. , 39 : 1 – 135 .
- LACK , D. 1954 . The natural regulation of animal numbers Clarendon Press, Oxford
- LACK , D. 1964 . A long-term study of the Great Tit . (Parus major). Brit. Ec. Soc. Jubilee Symposium , 1964 : 159 – 173 .
- TOMPA , F. S. 1964 . Factors determining the numbers of song sparrows, Melospiza melodia (Wilson), on Mandarte Island, B.C., Canada. . Acta. Zool. Fenn. , 109 : 1 – 73 .
- WYNNE-EDWARDS , V. C. 1962 . Animal dispersion in relation to social behaviour Oliver and Boyd. Edinburgh and London