APA (7th ed.) Citation

Harper Collins & Sample, G. (1996). Bird songs and calls of Britain and Northern Europe. Harper Collins.

Chicago Style (17th ed.) Citation

Harper Collins and Geoff Sample. Bird Songs and Calls of Britain and Northern Europe. London: Harper Collins, 1996.

MLA (8th ed.) Citation

Harper Collins and Geoff Sample. Bird Songs and Calls of Britain and Northern Europe. Harper Collins, 1996.