APA (7th ed.) Citation

Haeckel, E. Freedom in Science and Teaching. from the German of Ernst Haeckel.

Chicago Style (17th ed.) Citation

Haeckel, Ernst. Freedom in Science and Teaching. from the German of Ernst Haeckel.

MLA (9th ed.) Citation

Haeckel, Ernst. Freedom in Science and Teaching. from the German of Ernst Haeckel.

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