1. The vocal behaviour of the Indian Hill Mynah, Gracula religiosa;Bertram;Anim. Behav. Monogr,1970
2. Song variation in Maine Song Sparrows;Borror;Wilson Bull,1965
3. Functions of territorial song in the White-throated Sparrow;Falls,1969
4. The voice of the Chaffinch and its function as a language;Marler;Birds of Eastern and North Eastern Africa,1956