Yeats, William Butler,    1865-1939. <br/><br/>
The variorum edition of the plays of W. B. Yeats; edited by Russell K. Alspach, assited by Catherine C. Alspach 

 - London :    Melbourne[etc],    1966. 
 - xxv, 1336 p. ;    25 cm 
<br/><br/>Includes bibliographical references ( p. xix-xxiv)