function sources($visibility = 'Y')
{
if (is_null($this->_sources)) {
$links = FeedWordPress::syndicated_links(array("hide_invisible" => false));
$this->_sources = array("Y" => array(), "N" => array());
foreach ($links as $link) {
$this->_sources[$link->link_visible][] = $link;
}
}
$ret = array_key_exists($visibility, $this->_sources) ? $this->_sources[$visibility] : $this->_sources;
return $ret;
}