Cita APA (7a ed.)

Forey, P., & McCormick, S. (1993). Butterflies: The most common species of European butterflies described and illustrated in colour (1a ed.). Charles Letts.

Cita Chicago Style (17a ed.)

Forey, Pamela, y Sue McCormick. Butterflies: The Most Common Species of European Butterflies Described and Illustrated in Colour. 1a ed. London: Charles Letts, 1993.

Cita MLA (8a ed.)

Forey, Pamela, y Sue McCormick. Butterflies: The Most Common Species of European Butterflies Described and Illustrated in Colour. 1a ed. Charles Letts, 1993.