Use wp enqueue style to add css to header

according to:
http://codex.wordpress.org/Function_Reference/wp_enqueue_style

Please review this code as a better way to add style files on the plugin.

function d3simplecharts_add_stylesheets() {
        wp_register_style( 'nv.d3-style', plugins_url('nvd3/nv.d3.css', __FILE__) );
        wp_enqueue_style( 'nv.d3-style' );
        wp_register_style( 'd3chart-style', plugins_url('d3chart.css', __FILE__) );
        wp_enqueue_style( 'd3chart-style' );
        wp_register_style( 'query-ui-style', 'http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css' );
        wp_enqueue_style( 'query-ui-style' );
        wp_register_style( 'rickshaw.min-style', plugins_url('rickshaw/rickshaw.min.css ', __FILE__) );
        wp_enqueue_style( 'rickshaw.min-style' );
    }

add_action( 'wp_enqueue_scripts', 'd3simplecharts_add_stylesheets' );

http://wordpress.org/extend/plugins/d3-simplecharts/