Allen, Robert Livingston <br/><br/>
The verb system of present-day American English / 
Robert Livingston Allen. 
 - The Hague :  Mouton,  1966. 
 - 303 p.  ill. ;  26 cm. 
 - Janua Linguarum  Series Practica  24 .
<br/><br/>Bibliogr.: 274-303 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--United States<br/>English language--Verb