1. Aguila, M. (2019). 7 digital marketing channels. https://blog.spiralytics.com/digital-marketing-channels.
2. Bullock, L. (2019). https://www.smartinsights.com/digital-marketing-strategy/create-an-effective-digital-marketing-budget-2020/.
3. Chaffey, D. (2017). Digital marketing strategy advice—Smart insights digital marketing [online] smart insights. http://www.smartinsights.com.
4. Chaffey, D., & Ellis-Chadwick, F. (2012). Digital marketing: Strategy, implementation and practice (1st ed.). Harlow: Pearson Education.
5. Das, S. (2020). Innovations in digital banking service brand equity and millennial consumerism. Digital transformation and innovative services for business and learning (pp. 62–79). IGI Global. https://doi.org/10.4018/978-1-7998-5175-2.ch004.