Thomlinson, Ralph
California State University, 1976
Buku Teks
Thomlinson, Ralph, author
Random House , 1976
Buku Teks
edited by D. V. Glass and Roger Revelle
Edward Arnold, 1972
Buku Teks
United Nations
United Nations, 1986
Buku Teks
Woytinsky, W.S.
The Twentieth Century Fund, 1953
Buku Teks