APA (7th ed.) Citation

Young, J. H., & Griffenhagen, G. B. (2009). Old English Patent Medicines in America. Project Gutenberg.

Chicago Style (17th ed.) Citation

Young, James Harvey, and George B. Griffenhagen. Old English Patent Medicines in America. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Young, James Harvey, and George B. Griffenhagen. Old English Patent Medicines in America. Project Gutenberg, 2009.

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