APA

USA, . (19). Office of Air Program publication. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Programs.

Chicago

USA, . 19. Office of Air Program publication. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Programs.

Harvard

USA, . (19). Office of Air Program publication. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Programs.

MLA

USA, . Office of Air Program publication. Research Triangle Park, N.C: Environmental Protection Agency, Office of Air Programs. 19.