APA (7th ed.) Citation

Kirk, C., & Smith, W. (2012). Our Flowering Shrubs, and How to Know Them. Project Gutenberg.

Chicago Style (17th ed.) Citation

Kirk, Charles, and William Smith. Our Flowering Shrubs, and How to Know Them. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Kirk, Charles, and William Smith. Our Flowering Shrubs, and How to Know Them. Project Gutenberg, 2012.

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