 " The Nixon Doctrine 's Test in Indochina " . Time . 13 April 1970 . Retrieved 10 April 2007 . 
 " The Nixon Doctrine <a href='null_genetive' title='1'><mark>'s</mark></a>Test in Indochina " . Time . 13 April 1970 . Retrieved 10 April 2007 . 
 The Nixon Doctrine  Test in Indochina  . Time . 13 April 1970 . Retrieved 10 April 2007 .