D. R. Ladd

Phonetics in Phonology

D. R. Ladd, D. Ladd, 2011 .

A First Look at the Semantics and Pragmatics of Negative Questions and Tag Questions

D. R. Ladd, D. Ladd, 1981 .

Change in educational policy : self-studies in selected colleges and universities

D. R. Ladd, K. Mcbride, 1970 .