Willis, Alden T. <br/><br/>
Intermediate algebra / 
Alden T. Willis ; Carol L. Johnston. 
 - 2nd ed.  revised by Mary Jo Steig. 
 - Belmont, Calif. :  Wadsworth,  1987. 
 - 418p. :  25cm. 
 - The Johnston/Willis developmental mathematics series .
 - Johnston, C. J.  1911-  (Carol Lee),  Johnston/Willis developmental mathematics series. .