APA

Janssen G., Sklar M. & United States. (1998). Geographic allocation of state level nonroad engine population data to the county level: report no. NR-014. [Washington, D.C.]: Nonroad Engine Emission Modeling Team, Assessment and Modeling Division, EPA, Office of Mobile Sources.

Chicago

Janssen Greg, Sklar Mike and United States. 1998. Geographic allocation of state level nonroad engine population data to the county level: report no. NR-014. [Washington, D.C.]: Nonroad Engine Emission Modeling Team, Assessment and Modeling Division, EPA, Office of Mobile Sources.

Harvard

Janssen G., Sklar M. and United States. (1998). Geographic allocation of state level nonroad engine population data to the county level: report no. NR-014. [Washington, D.C.]: Nonroad Engine Emission Modeling Team, Assessment and Modeling Division, EPA, Office of Mobile Sources.

MLA

Janssen Greg, Sklar Mike and United States. Geographic allocation of state level nonroad engine population data to the county level: report no. NR-014. [Washington, D.C.]: Nonroad Engine Emission Modeling Team, Assessment and Modeling Division, EPA, Office of Mobile Sources. 1998.