Gamble, H. B., Sauerlender, O. H., & Duzinski, G. (1967). Selected effects of the Highway Beautification Act of 1965. Pennslyvania State University, Institute for Research on Land and Water Resources, Center for Regional Analysis Research.
Chicago-referens (17:e uppl.)Gamble, Hays Bentley, O. H. Sauerlender, och Gerald Duzinski. Selected Effects of the Highway Beautification Act of 1965. University Park, Pa.: Pennslyvania State University, Institute for Research on Land and Water Resources, Center for Regional Analysis Research, 1967.
MLA-referens (8:e uppl.)Gamble, Hays Bentley, et al. Selected Effects of the Highway Beautification Act of 1965. Pennslyvania State University, Institute for Research on Land and Water Resources, Center for Regional Analysis Research, 1967.