Harveson. Woody Plants of the Big Bend and Trans-Pecos. Texas A&M University Press.
Čikaški stil citiranja (17. izdanje)Harveson. Woody Plants of the Big Bend and Trans-Pecos. Texas A&M University Press.
MLA način citiranja (9. izdanje)Harveson. Woody Plants of the Big Bend and Trans-Pecos. Texas A&M University Press.
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