APA
Helgren D. M., University of Chicago, . (1979). Rivers of diamonds: an alluvial history of the lower Vaal basin, South Africa. Chicago: University of Chicago.
Chicago
Helgren David M, University of Chicago, . 1979. Rivers of diamonds: an alluvial history of the lower Vaal basin, South Africa. Chicago: University of Chicago.
Harvard
Helgren D. M., University of Chicago, . (1979). Rivers of diamonds: an alluvial history of the lower Vaal basin, South Africa. Chicago: University of Chicago.
MLA
Helgren David M, University of Chicago, . Rivers of diamonds: an alluvial history of the lower Vaal basin, South Africa. Chicago: University of Chicago. 1979.
TekstSerie: Research Paper - University of Chicago. Department of Geography ; no. 185Szczegóły wydania: Chicago : University of Chicago, 1979.Opis: XIX, 389 s. : il. ; 23 cmTyp zawartości: 
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