General properties, spectra, recoil reactions  Th : Thorium : System number 44 

 - 8. ed. 
 -  1988 
 - XVI, 248 S. : Ill., graph. Darst. 
 - Behrens, Robert; Bickel, Michael; Rolf Engleman Jr. .
<br/><br/><label>ISBN: </label>3540935894 0387935894 
<br/><br/><label>Universal Decimal Class. No.: </label>546