Example of usign Advanced Custom Fields and querying the reverse relationship. Discussion: http://www.advancedcustomfields.com/support/discussion/1979/how-to-getting-the-reverse-relationship-from-a-relationship-field

gistfile1.aw

<?php $args = array(
    'numberposts'     => -1,
    'offset'          => 0,
    'orderby'         => 'post_date',
    'order'           => 'DESC',
    'post_type'       => 'custom_post_type_here',
    'post_status'     => 'draft',
    'meta_query' => array(
            array(
                    'key' => 'custom_field_key_name',
                    'value' => $post->ID,
            )
    )
);
$posts_array = get_posts( $args );
if( $posts_array ) {
    echo '<ul>';
    foreach( $posts_array as $related ) {
        echo '<li>';
        echo '<a href="' . $related->guid . '">' . $related->post_title . '</a>';
        echo '</li>';
    }
    echo '</ul>';
}
?>

The 'value' parameter in the meta query doesn't seem to work for me. When removed it brings back all the posts unfiltered.