APA (7th ed.) Citation

Harper Collins & Sample, G. (1998). Bird call identification. Harper Collins.

Chicago Style (17th ed.) Citation

Harper Collins and Geoff Sample. Bird Call Identification. London: Harper Collins, 1998.

MLA (8th ed.) Citation

Harper Collins and Geoff Sample. Bird Call Identification. Harper Collins, 1998.

Warning: These citations may not always be 100% accurate.