The instruction of Ptah-hotep and The instruction of Ke'gemni: the oldest books in the world

Chicago citation style
Ptahhotep. The instruction of Ptah-hotep and The instruction of Ke'gemni: the oldest books in the world. 1906. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006791061. (Accessed December 13, 2018.)
APA citation style
Ptahhotep, (1906) The instruction of Ptah-hotep and The instruction of Ke'gemni: the oldest books in the world. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006791061
MLA citation style
Ptahhotep. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/006791061>.
Note: These citations are programmatically generated and may be incomplete.