Sampling volcanic gases in 1981

Chicago citation style
Zoller, William. Sampling volcanic gases in 1981. 1981-07. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/mshchem/id/6. (Accessed October 22, 2018.)
APA citation style
Zoller, William, (1981-07) Sampling volcanic gases in 1981. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/mshchem/id/6
MLA citation style
Zoller, William. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/mshchem/id/6>.
Note: These citations are programmatically generated and may be incomplete.