[1]	Eko. (2013). Top 5 Companies with Green Marketing Campaign, [online]. 
              http://ibrandstudio.com/articles/green-marketing-companies.
[2]	Faradina. (2017). Bersiaplah, 3 Dampak Global Warming ini Akan terjadi di Indonesia, 
      [online]. http://www.boombastis.com/dampak-global-warming-indonesia/93140.
[3]	Indrawati. 2015. Metode Penelitian Manajemen dan Bisnis. Bandung: Aditama
[4] Irwansyah. (2011). Corporate & Marketing Communications. Jakarta: PUSKOMBIS 
Mercubuana.
[5]	Ko, Eunju et.al. 2011. Green Marketing Functions in Building Corporate Image in the 
      	Retail Setting. Korea: Journal of Business Research
[6]	Mayer, Robert et.al. 2012. Passenger Perceptions of The Green Image Associated with 
      	Airlines. United Kingdom: Journal of Transport Geography 22 (2012) 179-186
[7]	Saragih, Samdysara. (2017). Pemerintah Dorong Penerapan Industri Ramah 
            Lingkungan, [online] http://industri.bisnis.com/read/20170426/99/648210/ 
            pemerintah-dorong-penerapan industri-ramah-lingkungan
[8]	Soekarso, Iskandar Putong. 2015. Kepemimpinan Kajian Teoritis dan Praktis ( Volume 1 dari kepemimpinan Edisi 1). Jakarta: Erlangga
[9]	Top Brand Award. (2017). FAQ, [online]. http://www.topbrand-award.com/faq.
[10]Utomo, Tri Hendro A. (2012). Ekolabel dan Peningkatan Daya Saing Produk, [online]. 
            http://www.indonesiagreenproduct.com/ekolabel-dan-peningkatan-daya-saing-
            produk/.
[11]Yadav, Rambalak et.al. 2016. The Influence of Green Marketing Functional in 
       Building Corporate Image. India: International Journal of Contemporary 
       Hospitality Management Vol. 28 No. 10,2016 pp. 2178-2196