Cabello Carro, Paz (1982), p. 52
Castroviejo, Santiago (1982), p. 98
Eastaugh, Nicholas (2004), p. 50
Asensio Fuentes, Antonio (1982), p. 32
Sánchez-Monge, Enrique (2001), pp. 171-172
Roquero, Ana (2006), p. 40
Perego, François (2005), pp. 640-642
Bärtels, Andreas (2005), p. 362