 " Indochina 's Crumbling Frontiers " . Time . 20 April 1970 . Retrieved 10 April 2007 . 
 " Indochina <a href='null_genetive' title='1'><mark>'s</mark></a>Crumbling Frontiers " . Time . 20 April 1970 . Retrieved 10 April 2007 . 
 Indochina  Crumbling Frontiers  . Time . 20 April 1970 . Retrieved 10 April 2007 .