APA
                    Alok kumar, Chabbi Sinhs & Sharma. (2007). Customer relationship management. NewDelhi: biztantra.
                
                    Chicago
                    Alok kumar, Chabbi Sinhs and Sharma. 2007. Customer relationship management. NewDelhi: biztantra.
                
                    Harvard
                    Alok kumar, Chabbi Sinhs and Sharma. (2007). Customer relationship management. NewDelhi: biztantra.
                
                    MLA
                    Alok kumar, Chabbi Sinhs and Sharma. Customer relationship management. NewDelhi: biztantra. 2007.