APA (7th ed.) Citation

Haeckel, E. (1905). Three lectures on evolution. Haldeman-Julius.

Chicago Style (17th ed.) Citation

Haeckel, Ernst. Three Lectures on Evolution. Girard, Kansas: Haldeman-Julius, 1905.

MLA (8th ed.) Citation

Haeckel, Ernst. Three Lectures on Evolution. Haldeman-Julius, 1905.

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