APA (7th ed.) Citation

Moucha, J., & Prochazka, F. (1963). Beautiful butterflies. Spring Books.

Chicago Style (17th ed.) Citation

Moucha, J., and F. Prochazka. Beautiful Butterflies. London: Spring Books, 1963.

MLA (9th ed.) Citation

Moucha, J., and F. Prochazka. Beautiful Butterflies. Spring Books, 1963.

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