Custom Simple Relationship where param list pods values

gistfile1.txt

 <?php
     $params = array(
         'limit' => 3,
         'where' => "source.meta_value = 'google'" // Relationship (Custom Simple)	
     );

 	$pods = pods( 'testimony', $params );

 	if ( !empty( $pods ) ) {
        while ($pods->fetch()){
            echo '<h2>' . $pods->display('post_title') . '</h2>';
            echo '<p>' . $pods->display('testimony_date') . '</p>';
            echo '<p>' . $pods->display('source') . '</p>';
            echo '<hr>';
        }
 	}
 ?>