Dear Los Angeles friend ... please don't buy grapes

Chicago citation style
Chavez, Cesar, 1927-, Correspondent. Dear Los Angeles friend ... please don't buy grapes. ca. 1968(?). Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/hb3z09p2h1. (Accessed May 25, 2018.)
APA citation style
Chavez, Cesar, 1927-, Correspondent, (ca. 1968(?)) Dear Los Angeles friend ... please don't buy grapes. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/hb3z09p2h1
MLA citation style
Chavez, Cesar, 1927-, Correspondent. Retrieved from the Digital Public Library of America <http://ark.cdlib.org/ark:/13030/hb3z09p2h1>.
Note: These citations are programmatically generated and may be incomplete.