edited by William R. Cline and Sidney Weintraub
Washington, D.C. , Brooklins Institution
Buku Teks
Matherson, Ross
John Wiley & Sons, 1978
Buku Teks SO
National Academy of Sciences , 1976
Buku Teks SO
United Nations , 1993
Buku Teks
Zenoff, David B.
Prentice-Hall, 1969
Buku Teks SO