Thakar, Girish, et al. “An Investigation of Customer Awareness With Reference to Green Marketing of Automobiles:An Empirical Study Conducted at Indore, Madhya Pradesh”. Indian Journal of Marketing, vol. 39, no. 9, Sept. 2009, pp. 11-21, https://indianjournalofmarketing.com/index.php/ijom/article/view/37081.