WALKAR O. C., BOYD H W, . (2005). MARKETING STRATEGY. NEW DELHI: TATA MC GRAW-HILL PUBLISHING COMPANY LIMITED.
WALKAR O C, BOYD H W, . 2005. MARKETING STRATEGY. NEW DELHI: TATA MC GRAW-HILL PUBLISHING COMPANY LIMITED.
WALKAR O C, BOYD H W, . MARKETING STRATEGY. NEW DELHI: TATA MC GRAW-HILL PUBLISHING COMPANY LIMITED. 2005.