The progressive in English

MLA

Scheffer, Johannes. The Progressive In English. Amsterdam [etc.]: North-Holland ; American Elsevier, 1975.

APA

Scheffer, J. (1975). The progressive in English. Amsterdam [etc.]: North-Holland ; American Elsevier.

Chicago

Scheffer, Johannes The Progressive In English. Amsterdam [etc.]: North-Holland ; American Elsevier, 1975.