APA

Pennsylvania State University, . (1972). Guide to reaserch in air pollution: projects active in calendar year 1972. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Quality Planning and Standards ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Chicago

Pennsylvania State University, . 1972. Guide to reaserch in air pollution: projects active in calendar year 1972. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Quality Planning and Standards ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Harvard

Pennsylvania State University, . (1972). Guide to reaserch in air pollution: projects active in calendar year 1972. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Quality Planning and Standards ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA

Pennsylvania State University, . Guide to reaserch in air pollution: projects active in calendar year 1972. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Quality Planning and Standards ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]. 1972.