Wrede. Trees, Shrubs, and Vines of the Texas Hill Country. Texas A&M University Press.
Čikaški stil citiranja (17. izdanje)Wrede. Trees, Shrubs, and Vines of the Texas Hill Country. Texas A&M University Press.
MLA način citiranja (8. izdanje)Wrede. Trees, Shrubs, and Vines of the Texas Hill Country. Texas A&M University Press.
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