Waddington, C. (1978). The man-made future. St.Martin's.
Lua i Stíl Chicago (17ú heag.)Waddington, C.H. The Man-made Future. New York: St.Martin's, 1978.
Lua MLA (9ú heag.)Waddington, C.H. The Man-made Future. St.Martin's, 1978.
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