Helmets

Chicago citation style
Helmets. 1979. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz808768w. (Accessed July 19, 2018.)
APA citation style
(1979) Helmets. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz808768w
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/nz808768w>.
Note: These citations are programmatically generated and may be incomplete.