Betley, Jan Andrzej  (?-1991). <br/><br/>
Belgium and Poland in international relations 1830-1931 / 
by J. A. Betley. 
 - 's-Gravenhage :  Mouton,  1960. 
 - 298 s., 2 mapy ;  23 cm. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Belgia--polityka--Polska--19-20 w.<br/>Polska--polityka--Belgia--19-20 w.