 " Indochina : More and More Fighters " . Time . 15 June 1970 . Retrieved 10 April 2007 . 
 " Indochina : More and More Fighters " . Time . 15 June 1970 . Retrieved 10 April 2007 . 
 Indochina : More and More Fighters  . Time . 15 June 1970 . Retrieved 10 April 2007 .