<div>
	<span class="citation-author"><?php echo isset($authors) ? $authors : ''; ?></span>
    <span class="citation-title"><?php echo isset($title) ? $title : ''; ?></span>
    <span class="citation-subtitle"><?php echo isset($subtitle) ? $subtitle : ''; ?></span>
    <span class="citation-volume"><?php echo isset($volume) ? $volume : ''; ?></span>
    <span class="citation-issue"><?php echo isset($issue) ? $issue : ''; ?></span>
    <span class="citation-pages"><?php echo isset($pages) ? $pages : ''; ?></span>
</div>