1. The evolution of alarm calls: altruism or manipulation?;Charnov;Am. Nat,1975
2. Populations of tits and goldcrests and their food supply in pine plantations;Gibb;Am. Nat,1960
3. Ecology of social organization in the black-capped chickadee;Glase;The Living Bird,1973
4. Contribution to the food biology of tits especially about storing of surplus food. Part IV. A comparative analysis of Parus atricapillus L., P. cristatus L. and P. ater L;Haftorn;Kgl. Norske Vidensk. Selsk. Skr,1956
5. Storage of surplus food by the boreal chickadee Parus hudsonicus in Alaska, with some records on the mountain chickadee Parus gambeli in Colorado;Haftorn;Ornis Scand,1974