Searching for item types within a collection using MultiCollections plugin

gistfile1.aw

<?php if($multiItems = multicollections_get_items_in_collection(10, 'Book')):
    foreach($multiItems as $multiItem) {
        if($fullsizeHtml = item_fullsize(array('class' => 'theme-book-cover', 'alt' => item('Dublin Core','Title')))) {
            echo '<div class="theme-book">';
            echo '<a href="'.item('permalink').'">'.$fullsizeHtml.'</a>';
            echo '<p class="theme-book-meta three columns omega"><span class="theme-book-title">'.link_to_item().'</span><br><span class="theme-book-author">by '.item('Dublin Core','Creator').'</span></p>';
            echo '</div>';
        }
    }
endif; 
?>