Portwood, M. E., & Portwood, T. B. (1977). Our nation's story. Steck-Vaughn.
Chicagoスタイル(17版)引用形式Portwood, Mary E., , Thomas B. Portwood. Our Nation's Story. Austin: Steck-Vaughn, 1977.
MLA(8版)引用形式Portwood, Mary E., , Thomas B. Portwood. Our Nation's Story. Steck-Vaughn, 1977.
警告: この引用は必ずしも正確ではありません.