APA (7th ed.) Citation

Still, J., & Sterry, P. (1996). Butterflies & moths of Britain and Europe. Harper Collins.

Chicago Style (17th ed.) Citation

Still, John, and Paul Sterry. Butterflies & Moths of Britain and Europe. London: Harper Collins, 1996.

MLA (8th ed.) Citation

Still, John, and Paul Sterry. Butterflies & Moths of Britain and Europe. Harper Collins, 1996.