Rowell, S. C. (1989). "Lithuania and the West, 1337–41—A question of sources". Journal of Baltic Studies. 4 (20): 312. doi:10.1080/01629778900000161. ISSN0162-9778.
Nikžentaitis, Alvydas (1989). Gediminas (in Lithuanian). Vilnius: Vyriausioji enciklopedijų redakcija. pp. 55–57. OCLC27471995.
Rowell, S. C. (1989). "Lithuania and the West, 1337–41—A question of sources". Journal of Baltic Studies. 4 (20): 312. doi:10.1080/01629778900000161. ISSN0162-9778.