Vauchez, André; Dobson, Richard Barrie; Lapidge, Michael (2000). Encyclopedia of the Middle Ages, Volume 1. Routledge. p. 163. «After the death in 1430 of Vitold (Vytautas), who had governed the Grand Duchy under the nominal sovereignty of Jagiello, discrimination against the Ruthenians led to a civil war.»
France, John (2005). The Crusades and the expansion of Catholic Christendom, 1000-1714. Routledge. p. 265. ISBN978-0-415-37128-5. «The costs of these troops and the nagging wars with Poland, which ended indecisively in 1435, bore heavily upon the cities, merchants, and knightly settlers in Prussia, with the result that the Grand Master found ever more resistance to his central and despotic control.»
Koncius, Joseph B. (1964). Vytautas the Great, Grand Duke of Lithuania. Miami: Franklin Press. pp. 182-184. LCC66089704.
Sužiedėlis Sužiedėlis, Simas Simas, ed. (1970–1978). «Švitrigaila». Encyclopedia LituanicaV. Boston, Massachusetts: Juozas Kapočius. pp. 348-350. LCC74-114275.
Sužiedėlis Sužiedėlis, Simas Simas, ed. (1970–1978). «Žygimantas». Encyclopedia LituanicaVI. Boston, Massachusetts: Juozas Kapočius. pp. 361-363. LCC74-114275.
Zinkus Zinkus, Jonas Jonas, ed. (1985–1988). «Ašmenos mūšis». Tarybų Lietuvos enciklopedija(en lituano)I. Vilnius, Lithuania: Vyriausioji enciklopedijų redakcija. p. 115. LCC86232954.
Sužiedėlis Sužiedėlis, Simas Simas, ed. (1970–1978). «Pabaiskas, Battle of». Encyclopedia LituanicaIV. Boston, Massachusetts: Juozas Kapočius. pp. 140-141. LCC74-114275.