APA
                    Alok Kumar, Sharma & Sinha. (2007). Customer Relationship Managment. New Delhi: biztantra.
                
                    Chicago
                    Alok Kumar, Sharma and Sinha. 2007. Customer Relationship Managment. New Delhi: biztantra.
                
                    Harvard
                    Alok Kumar, Sharma and Sinha. (2007). Customer Relationship Managment. New Delhi: biztantra.
                
                    MLA
                    Alok Kumar, Sharma and Sinha. Customer Relationship Managment. New Delhi: biztantra. 2007.