1. Able KP (1974) Environmental influences on the orientation of free-flying nocturnal bird migrants. Anim Behav 22: 224–238
2. Able KP (1978) Field studies of the orientation cue hierarchy of nocturnal songbird migrants. In: Schmidt-Koenig K, Keeton WT (eds) Animal migration, navigation, and homing. Springer, Berlin Heidelberg New York, p 228
3. Able KP (1980a) Mechanisms of orientation, navigation and homing. In: Gauthreaux SA (ed) Animal migration, orientation, and navigation. Academic Press, London New York, p 325.
4. Able KP (1980b) Evidence on migratory orientation from radar and visual observations: North America. Acta XVIIth Congr Int Ornithol. Dtsch Ornithol Ges, Berlin
5. Able KP (1982) Field studies on avian nocturnal migratory orientation. I. Interaction of sun, wind and stars as directional cues. Anim Behav (in press)