Lua APA (7ú heag.)
ebrary, Inc. (1990). Competitiveness of the U.S. minerals and metals industry. National Academy Press.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc. Competitiveness of the U.S. Minerals and Metals Industry. Washington, D.C. ; [Great Britain]: National Academy Press, 1990.
Lua MLA (9ú heag.)
ebrary, Inc. Competitiveness of the U.S. Minerals and Metals Industry. National Academy Press, 1990.
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