1. Balaban ES (1986) Cultural and genetic variation in swamp sparrows (Melospiza georgiana). Doctoral Diss, The Rockefeller University, New York
2. Balaban E (1987) Behavioural salience of geographical song variants. Behaviour 105:297–32
3. Baker MC (1994) Loss of function in territorial song: comparison of island and mainland populations of the single honeyeater (Meliphaca virescens). Auk 111:178–184
4. Baker MC, Thompson D, Sherman G, Cunningham M (1981) The role of male vs. male interactions in maintaining population dialect structure. Behav Ecol Sociobiol 8:65–69
5. Beecher MD, Stoddard PK (1990) The role of birdsong and calls in individual recognition: contrasting field and laboratory results. In: Stebbins WC, Berkley MA (eds) Comparative perception, vol. II. Complex signals. Wiley, New York, p 375