Wordpress Query Parameters Post Type Parameter

Display only pages:
$query = new WP_Query( array( 'post_type' => 'page' ) );

Display ‘any‘ post type (retrieves any type except revisions and types with ‘exclude_from_search’ set to TRUE):
$query = new WP_Query( array( 'post_type' => 'any' ) );

Display multiple post types, including custom post types:
$args = array(
    'post_type' => array( 'post', 'page', 'movie', 'book' )
);
$query = new WP_Query( $args );