Scheffer, J. (1975). The Progressive in English. North-Holland.
Chicagoスタイル(17版)引用形式Scheffer, Johannes. The Progressive in English. Amsterdam: North-Holland, 1975.
MLA(9版)引用形式Scheffer, Johannes. The Progressive in English. North-Holland, 1975.
警告: この引用は必ずしも正確ではありません.