Load custom CSS and JS scripts for single custom post from plugin

function custom_scripts(){
    if( is_single() && get_post_type()=='books' ){
        wp_enqueue_style( 'bootstrap', plugin_dir_url( __FILE__ ) . 'css/bootstrap.min.css' );
        wp_enqueue_script( 'prism', 'https://cdnjs.cloudflare.com/ajax/libs/prism/1.4.1/prism.js');
	 }
}
add_action('wp_enqueue_scripts', 'custom_scripts');