British Civil Airworthiness requirements, CAP 460, section A : certification and approval procedures  [Books]. 
Civil Aviation Authority. 
 - London  Civil Aviation Authority  1985 
<br/><br/><label>ISBN: </label>0860392449  0.00 
<br/><br/><label>Dewey Class. No.: </label>TL/671.1  / CIV