For a summary of the Cantorian theory as it stood in the early years of the twentieth century, see Young and Young (1906), and the magisterial Hausdorff (1914); for further reading on the development of set theory, see the books Ferreiros 1999, Hallett 1984, Hawkins 1970, and Moore 1982. See also the various papers on the history of set theory by Akihiro Kanamori (especially Kanamori 1996, 1997, 2003, 2004, 2012) and the joint paper with Dreben (Dreben and Kanamori 1997). For the place of set theory in the development of modern logic, see Mancosu et al., 2009, especially pages 345–352.