(1991). The World book health and medical annual 1991. World book.
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Chicago-čujuhus (17. p.)
The World Book Health and Medical Annual 1991. Chicago: World book, 1991.
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MLA-čujuhus (9. p.)
The World Book Health and Medical Annual 1991. World book, 1991.
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Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.