- ^ a b Illingworth 2001, p. 4.
- ^ Lacy 1991, pp. 35–37.
- ^ Illingworth 2001, p. 3.
- ^ Beroul 1978, p. 11.
- ^ Beroul 1978, pp. 25–32.
- ^ Lacy 1999.
- ^ Sargent-Baur 2004, p. 335.
- ^ Beroul 1978, p. 13.
- ^ Illingworth 2001.
- ^ Reid 1965.
- ^ Bédier 2013.
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