MLA

Helga Hofmann, and T. Marktanner. Butterflies and Moths of Britain and Europe. London: HarperCollins, 1995.

APA

Helga Hofmann, H. Hofmann, & T. Marktanner, T. Marktanner. (1995). Butterflies and Moths of Britain and Europe. London: HarperCollins.

Chicago

Helga Hofmann, and T. Marktanner. Butterflies and Moths of Britain and Europe. : London: HarperCollins, 1995.