Portable air supply unit

Chicago citation style
Portable air supply unit. 1980-02-01. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz809577m. (Accessed June 20, 2018.)
APA citation style
(1980-02-01) Portable air supply unit. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz809577m
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/nz809577m>.
Note: These citations are programmatically generated and may be incomplete.