Liljedahl, D. R., & Porter, H. E. (1972). Vehicle testing to determine feasibility of emission inspection at altitude. Environmental Protection Agency.
Chicago Style (17th ed.) CitationLiljedahl, Douglas R., and Harold E. Porter. Vehicle Testing to Determine Feasibility of Emission Inspection at Altitude. [Washington, D.C.]: Environmental Protection Agency, 1972.
MLA (9th ed.) CitationLiljedahl, Douglas R., and Harold E. Porter. Vehicle Testing to Determine Feasibility of Emission Inspection at Altitude. Environmental Protection Agency, 1972.
Warning: These citations may not always be 100% accurate.