Não informado. (1972). Geographical survey. Ball State University, Department of Geography and Geology.
Chicagoスタイル(17版)引用形式Não informado. Geographical Survey. Muncie, Ind: Ball State University, Department of Geography and Geology, 1972.
MLA(8版)引用形式Não informado. Geographical Survey. Ball State University, Department of Geography and Geology, 1972.
警告: この引用は必ずしも正確ではありません.