Thomasson, J. R. (1979). Late Cenozoic grasses and other angiosperms from Kansas, Nebraska and Colorado: Biostratigraphy and relationships to living taxa. University of Kansas.
Čikaški stil citiranja (17. izdanje)Thomasson, Joseph R. Late Cenozoic Grasses and Other Angiosperms from Kansas, Nebraska and Colorado: Biostratigraphy and Relationships to Living Taxa. Lawrence: University of Kansas, 1979.
MLA način citiranja (9. izdanje)Thomasson, Joseph R. Late Cenozoic Grasses and Other Angiosperms from Kansas, Nebraska and Colorado: Biostratigraphy and Relationships to Living Taxa. University of Kansas, 1979.
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