APA (7th ed.) Citation

Haeckel, E. (1974). Art forms in nature Ernst Haeckel. Dover Publications.

Chicago Style (17th ed.) Citation

Haeckel, Ernst. Art Forms in Nature Ernst Haeckel. New York: Dover Publications, 1974.

MLA (9th ed.) Citation

Haeckel, Ernst. Art Forms in Nature Ernst Haeckel. Dover Publications, 1974.

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