Merkoša sitáhtat
APA-čujuhus (7. p.)
ebrary, Inc. (2000). The impact of selling the federal helium reserve. National Academy Press.
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Chicago-čujuhus (17. p.)
ebrary, Inc. The Impact of Selling the Federal Helium Reserve. Washingon, D.C.: National Academy Press, 2000.
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MLA-čujuhus (9. p.)
ebrary, Inc. The Impact of Selling the Federal Helium Reserve. National Academy Press, 2000.
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