 The investigation of promises as speech acts is furthered in the work of Rawls (1955), William Alston (1964, 1994), John Searle (1963, 1965, 1979, 1980, 1985), David Jones (1966), Otto Hanfling (1975), and Michael Pratt (2003, 2007), Christina Corredor (2001), and Vincent Blok (2013) among others. See Harris and McKinney (2021) for a contemporary survey