The New Encyclopaedia Britannica in 30 Volumes :  Macropaedia, 4 

 - 15th ed. 
 - Chicago :  Encyclopaedia Britannica,  1979. 
 - 1132 p. :  il. 
<br/><br/> Macropaedia (volumes 1 to 19): Knowledge in Depth. -- Volume 4: Ceylon - Congreve 
<br/><br/><label>ISBN: </label>0-85229-399-9 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>ENCICLOPEDIA