PHP code for widgets

I’m trying to figure out how to code in a sidebar widget in this piece of code

<?php if ( ! dynamic_sidebar( 'sidebar' ) ) : // If the user hasn't defined any specific widgets in the admin yet, display a couple dummy widgets, as written below ?>
				<aside id="archives" class="widget">
					<h3 class="side-title"><?php _e( 'Archives', 'naked' ); // WordPress archives widget ?></h3>
					<ul>
						<?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
					</ul>
				</aside>

				<aside id="meta" class="widget">
					<h3 class="side-title"><?php _e( 'Meta', 'naked' ); // WordPress meta widget ?></h3>
					<ul>
						<?php wp_register(); ?>
						<li><?php wp_loginout(); ?></li>
						<?php wp_meta(); ?>
					</ul>
				</aside>

Thanks! My site: angelebaby.com