Birkhead, T. (1991). The magpies: The ecology and behaviour of black-billed and yellow -billed Magpies. T & A D Poyse.
Chicago Style (17th ed.) CitationBirkhead, Tim. The Magpies: The Ecology and Behaviour of Black-billed and Yellow -billed Magpies. London: T & A D Poyse, 1991.
MLA (9th ed.) CitationBirkhead, Tim. The Magpies: The Ecology and Behaviour of Black-billed and Yellow -billed Magpies. T & A D Poyse, 1991.
Warning: These citations may not always be 100% accurate.