APA (7th ed.) Citation

Liebig, J., & Gardner, J. (2003). Familiar Letters on Chemistry, and Its Relation to Commerce, Physiology, and Agriculture. Project Gutenberg.

Chicago Style (17th ed.) Citation

Liebig, Justus, and John Gardner. Familiar Letters on Chemistry, and Its Relation to Commerce, Physiology, and Agriculture. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Liebig, Justus, and John Gardner. Familiar Letters on Chemistry, and Its Relation to Commerce, Physiology, and Agriculture. Project Gutenberg, 2003.

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