Mathematics essential for elementary statistics; a self-teaching manual

Chicago citation style
Walker, Helen Mary, 1891-. Mathematics essential for elementary statistics; a self-teaching manual. [1934]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006222135. (Accessed November 13, 2018.)
APA citation style
Walker, Helen Mary, 1891-, ([1934]) Mathematics essential for elementary statistics; a self-teaching manual. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006222135
MLA citation style
Walker, Helen Mary, 1891-. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/006222135>.
Note: These citations are programmatically generated and may be incomplete.