Nightjars and Their Allies: The Caprimulgiformes
D.T. Holyoak
Roberts (1991), Copete and Gustamante (1992), Cresswell (1992), Cresswell
and Alexander (1992), Dunning (1992), Olaffson (1992), Van Den Berk and Vim
der Winden (1992), Chandler ct ... Voice recordings: e.g., Ranit and Cleere (1998
).