Report no. 9 : the measures and variables in the sustaining effects study /

Chicago citation style
System Development Corporation. Report no. 9 : the measures and variables in the sustaining effects study /. 1978. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011420189. (Accessed December 19, 2018.)
APA citation style
System Development Corporation, (1978) Report no. 9 : the measures and variables in the sustaining effects study /. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011420189
MLA citation style
System Development Corporation. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/011420189>.
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