Gustafson. A Naturalist's Guide to the Texas Hill Country. Texas A&M University Press.
Cita Chicago (17th ed.)Gustafson. A Naturalist's Guide to the Texas Hill Country. Texas A&M University Press.
Cita MLA (8th ed.)Gustafson. A Naturalist's Guide to the Texas Hill Country. Texas A&M University Press.
Atenció: Aquestes cites poden no estar 100% correctes.