The English verb auxiliaries.
APA Citation
Twaddell, W. F. (William Freeman). (1963). The English verb auxiliaries. 2d ed. rev. Providence: Brown University Press.
MLA Citation
Twaddell, W. F. (William Freeman). The English Verb Auxiliaries. 2d ed. rev. Providence: Brown University Press, 1963.
Warning: These citations may not always be complete (especially for serials).