Hertfordshire, by R. Lydekker

Chicago citation style
Lydekker, Richard, 1849-1915. Hertfordshire, by R. Lydekker. 1909. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000150727. (Accessed September 23, 2018.)
APA citation style
Lydekker, Richard, 1849-1915, (1909) Hertfordshire, by R. Lydekker. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000150727
MLA citation style
Lydekker, Richard, 1849-1915. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/000150727>.
Note: These citations are programmatically generated and may be incomplete.