Helmet

Chicago citation style
Helmet. 1983. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/df65vz21g. (Accessed July 19, 2018.)
APA citation style
(1983) Helmet. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/df65vz21g
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/df65vz21g>.
Note: These citations are programmatically generated and may be incomplete.