The design and implementation of the 4.3 BSD UNIX operating system / 
Samuel J. Leffler ... [et al.] 
 - Reading, Mass. :  Addison-Wesley,  1989 
 - 471 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>UNIX (Computer operating system)