Saldana, J. (2016). The Coding Manual for. Qualitative Researchers (3rd ed.) London, UK: Sage. Chapter 1. Introduction to code and coding.
Elliott, V. (2018). Thinking about the Coding Process in Qualitative Data Analysis. The Qualitative Report, 23(11), 2850-2861. Retrieved from https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=3560&context=tqr
Williams, M., & Moser, T. (2019). The Art of Coding and Thematic Exploration in Qualitative Research. International Management Review, 15, 45. http://www.imrjournal.org/uploads/1/4/2/8/14286482/imr-v15n1art4.pdf