State or Local Govt Document
Chicago Manual 14.288
See examples below:
Notes-Bibliography Style
       1st Footnote or Endnote
           10. Illinois Institute for Environmental Quality (IIEQ), Review and Synopsis
       of Public Participation regarding Sulfur Dioxide and Particulate Emissions, by 
       M. Marden, IIEQ Document no. 77/21 (Chicago, 1977), 44-45.
       Bibliography
       Usually not cited in bibliography.
Author-Date Style
       1st Parenthetical Note
       (IIEQ 1977, 44-45) 
       Reference List
       Illinois Institute for Environmental Quality (IIEQ). 1977. Review and Synopsis of
           Public Participation regarding Sulfur Dioxide and Particulate Emissions. By 
           Sidney M. Marsden. IIEQ Document no. 77/21. Chicago.