Volume zero X protocol reference manual:  For version 11 of the x window sytem/ 

 - 2nd ed. 
 -  c1990 
 - xv, 483p.:  ill.;  25 cm. 
<br/><br/> includes appendix, glossary and index 
<br/><br/><label>ISBN: </label>0-937175-50-1 
<br/><br/><label>Dewey Class. No.: </label>BRef. 001.6  / X79