Display Multiple Values of Same Key

by 

<?php
// get an array of multiple values
$post_meta_array = get_post_meta($post->ID, 'link'); // do not use 'true' as the third argument
// echo the link for each value 
foreach ($post_meta_array as $post_meta) {
    echo '<a href="' . $post_meta . '" target="_blank">Images Source</a>';
}