edited by Astri Suhrkel and Lela Garner Noble
Frederick A. Praeger, 1977
Buku Teks
Shimko, Keith L., 1962-, author
Cengage Learning, 2016
Buku Teks
David Held, Anthony McGrew, editor
Polity Press, 2000
Buku Teks
Williams, Phil, author
Thomson Wadsworth, 2006
Buku Teks
Magruder, Frank Abbott
Allyn and Bacon, 1939
Buku Teks