Russett, Bruce
Wadsworth, 2010
Buku Teks
Russett, Bruce
W.H. Freeman, 1985
Buku Teks SO
Kinsella, David
Wadsworth, Cengage Learning, 2013
Buku Teks SO
edited by Mathew J. Betz, Pat McGowan and Rolf T. Wigand
Duke Press Policy Studies, 1984
Buku Teks
resources for the future, 1981
Buku Teks SO