Primer of Real Functions  
Boas, Jr, Ralph P., 
 - 4th ed. 
 - 1 online resource   digital, PDF file(s). 
<br/><br/> Title from publisher's bibliographic system (viewed on 01 Sep 2015). 
<br/><br/><label>ISBN: </label>9780883850299 (hardback) | 9781614440130 (ebook)