Bibby, C. J. (1992). Bird Census Techniques Collin J. Bibby, Neil D. Burges. Academic.
Cita Chicago Style (17a ed.)Bibby, Collin J. Bird Census Techniques Collin J. Bibby, Neil D. Burges. Academic, 1992.
Cita MLA (8a ed.)Bibby, Collin J. Bird Census Techniques Collin J. Bibby, Neil D. Burges. Academic, 1992.
Precaución: Estas citas no son 100% exactas.