Byrd, Hazel Patricia <br/><br/>
Modals in present-day American English :  theories, applications and resource materials for the teaching of English as a second language / 
by Hazel Patricia Byrd 
 - Florida :  University of Florida,  1974 
 - vii, 220 p. ;  21 cm. 
<br/><br/>Thesis (Ph.D.) - University of Florida, 1974 
<br/><br/>Bibliography : p. 216-219 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Languages, Modern--Study and teaching