Schikele, Rainer, author
McGraw-Hill, 1954
Buku Teks
edited by Don F. Hadwiger and Ross B. Talbot
Academy of Political Science, 1982
Buku Teks
edited by Don E. Hadwiger and Ross B Talbot
Academy of Political Science, 1982
Buku Teks
Segal, Elizabeth A.
Buku Teks
Segal, Elizabeth A., author
F.E. Peacock Publishers, Inc., 1998
Buku Teks