wikindx/conf/metadata.php

<?php

$meta['url'] = array('string');
$meta['bibStyle'] = array(
    'multichoice',
    '_choices' => array(
        'abnt',
        'apa',
        'britishmedicaljournal',
        'cfb',
        'chicago-ad',
        'chicago-ft',
        'harvard',
        'ieee',
        'mla',
        'turabian',
        'wikindx',
    )
);