Leighton, Marian
St. Martin's Press, 1989
Buku Teks SO
Petrov, Vladimir
American Institute fo Public Research, 1975
Buku Teks
Farer, Tom J.
Carnegie Endowment for International Peace, 1976
Buku Teks SO
Leonhard, Wolfgang
Rinehart and Winston, 1978
Buku Teks
edited by William J. Taylor, Jr., Cha Young-koo, and John Q. Blodgett
Westview Press, 1990
Buku Teks SO