A policy on geometric design of highways and streets, 2011
American Association of State Highway and Transportation Officials
American Association of State Highway and Transportation Officials, 2011
 Buku Teks
Floyd, Rita
Security and the environment: securitisation theory and US environmental security policy
Cambridge University Press, 2010
 eBooks
Cohen, Saul B.
Geography and the American environment / Saul B. Cohen
Vioce of America Forum Lectures , 1968
 Buku Teks
Energy and the environment: a risk-benefit approach / edited by Holt Ashley, Richard L. Rudman, and Christopher Whipple
Pergamon Press, 1976
 Buku Teks
Makin, John H.
Debt and taxes / John H. Makin and Norman J. Ornstein
American Entreprise Institute, 1991
 Buku Teks