Sydney Armitage-Smith, John of Gaunt: King of Castile and Leon, Duke of Aquitaine and Lancaster, Earl of Derby, Lincoln, and Leicester, Seneschal of England, Charles Scribner's Sons, 1905, pp. 390–391.
Sydney Armitage-Smith, John of Gaunt: King of Castile and Leon, Duke of Aquitaine and Lancaster, Earl of Derby, Lincoln, and Leicester, Seneschal of England, Charles Scribner's Sons, 1905, pp. 462.
Sydney Armitage-Smith, John of Gaunt: King of Castile and Leon, Duke of Aquitaine and Lancaster, Earl of Derby, Lincoln, and Leicester, Seneschal of England, Charles Scribner's Sons, 1905, pp. 77.