Park, C. F., & Freeman, M. C. (1968). Affluence in jeopardy, minerals and the political economy. Freeman, Cooper, & Co.
Lua i Stíl Chicago (17ú heag.)Park, Charles Frederick, agus Margaret C. Freeman. Affluence in Jeopardy, Minerals and the Political Economy. California: Freeman, Cooper, & Co, 1968.
Lua MLA (9ú heag.)Park, Charles Frederick, agus Margaret C. Freeman. Affluence in Jeopardy, Minerals and the Political Economy. Freeman, Cooper, & Co, 1968.
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