<div class="col-sm-4">
<div class="bq_s">
<h2><a class"alphabit" name="A HARFİ">A HARFİ</a></h2><div class="bq_fl">
A Yazar 1
A Yazar 2
A Yazar 3
</div>
</div>
</div>


<div class="col-sm-4">
<div class="bq_s">
<h2><a class"alphabit" name="B HARFİ '">B HARFİ</a></h2><div class="bq_fl">
B Yazar 1
B Yazar 2
B Yazar 3
</div>
</div>
</div>

foreach($authors as $author) {
$current = strtolower($author['data']->display_name[0]);
$display_name = $author['data']->display_name;
$author_profile_url = get_author_posts_url($author['ID']);
if ($last != $current) {
echo '<div class="col-sm-4"><div class="bq_s"><h2><a class"alphabit" name="' . strtoupper($current) . '">' . strtoupper($current) . '</a></h2><div class="bq_fl">';
$last = $current;
 }
 echo '<div class="bqLn"><a href="'. $author_profile_url. '">'.$display_name.'</a></div></div></div></div>';
}