Query Taxonomy
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'reference', 'terms' => array( '25', ' 26' ), 'field' => 'term_id', ), );
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'reference', 'terms' => array( '25', ' 26' ), 'field' => 'term_id', ), );