bonus- The Psychology of Goodbye
Welp. Here it is. All the thanks you and goodbyes in the world would not be enough.
Schwörer, Bettina, et al. “Saying Goodbye and Saying It Well: Consequences of a (Not) Well-Rounded Ending.” Motivation Science, 7 Feb. 2019, https://doi.org/10.1037/mot0000126.