edited by Rudolf L. Tokes
New York University Press, 1978
Buku Teks
Leighton, Marian
St. Martin's Press, 1989
Buku Teks
Petrov, Vladimir, author
American Institute fo Public Research, 1975
Buku Teks
Farer, Tom J., author
Carnegie Endowment for International Peace, 1976
Buku Teks
Leonhard, Wolfgang
Rinehart and Winston, 1978
Buku Teks