+ <li class="checkbox"><span class="error">{{ form.ebook.errors }}</span><label for="id_ebook">{{ form.ebook.label }}:</label> {{ form.ebook }}</li>
+ <li class="checkbox"><span class="error">{{ form.audiobook.errors }}</span><label for="id_audiobook">{{ form.audiobook.label }}:</label> {{ form.audiobook }}</li>