Klimas, P., & Jurgėla, C. R. 1. (1945). Ghillebert de Lannoy in medieval Lithuania: Voyages and embassies of an ancestor of one of America's great presidents. New York, N.Y.: Lithuanian American Information Center.

Klimas, Petras, and Constantine R. 1904- Jurgėla. Ghillebert De Lannoy in Medieval Lithuania: Voyages and Embassies of an Ancestor of One of America's Great Presidents. New York, N.Y.: Lithuanian American Information Center, 1945.

Klimas, Petras, and Constantine R. 1904- Jurgėla. Ghillebert De Lannoy in Medieval Lithuania: Voyages and Embassies of an Ancestor of One of America's Great Presidents. New York, N.Y.: Lithuanian American Information Center, 1945.