APA (7th ed.) Citation

Gaerdt, H. (1911). Gärtnerische Düngerlehre.

Chicago Style (17th ed.) Citation

Gaerdt, Heinrich. Gärtnerische Düngerlehre. 1911.

MLA (9th ed.) Citation

Gaerdt, Heinrich. Gärtnerische Düngerlehre. 1911.

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