- ^ a b Heinemann 1975, pp. 232–250
- ^ a b c d e f Taylor 2007
- ^ Beneš 2016, pp. 18–52
- ^ a b c Howard-Hill 1991, pp. 274–285
- ^ a b c d e f Gurnis 2018
- ^ a b Redworth 2003
- ^ "Middleton" 2018
- ^ Dutton 2014
- ^ Taylor 2007, p. 712
- ^ Middleton 2007, pp. 1773–1824
- ^ Bicks 2009, pp. 463–484
- ^ a b c Sargent 1971, pp. 721–730
- ^ a b Cogswell 1984, pp. 273–288
- ^ a b c Taylor 1994, pp. 283–314
- ^ Wittek 2015, pp. 423–446
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