Bibby, C. J. (2000). Bird census techniques (2nd ed.). Academic.
Cita Chicago Style (17a ed.)Bibby, C. J. Bird Census Techniques. 2nd ed. London [etc.]: Academic, 2000.
Cita MLA (9a ed.)Bibby, C. J. Bird Census Techniques. 2nd ed. Academic, 2000.
Precaución: Estas citas no son 100% exactas.