Principles of auditing & other assurance services 
Whittington,O. Ray. 
 - 20th edition. 
 -  McGraw-Hill Education,  2016 
 - 878 pages. 
978-0-07-772914-1
Auditing.
657.45 W626 2016
                        978-0-07-772914-1
Auditing.
657.45 W626 2016