User's guide for Hiway-2 :
a highway air pollution model /
by William B. Petersen.

APA Citation

Petersen, W. B. (1980). User's guide for Hiway-2: a highway air pollution model. Research Triangle Park, N.C.: U.S. Environmental Protection Agency.

MLA Citation

Petersen, William B. User's Guide for Hiway-2: a Highway Air Pollution Model. Research Triangle Park, N.C.: U.S. Environmental Protection Agency, 1980.

Warning: These citations may not always be complete (especially for serials).