Guest Post Type

// WP_Query arguments
$args = array(
	'post_type'              => array( 'guest-author' ),
	'post_status'            => array( 'publish' ),
	'nopaging'               => true,
	'ignore_sticky_posts'    => false,
	'order'                  => 'ASC',
	'orderby'                => 'title',
);

// The Query
$guests = new WP_Query( $args );

// The Loop
if ( $guests->have_posts() ) {
	while ( $guests->have_posts() ) {
		$guests->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();