post object

I created a custom post object field.
The user can make multiple selections.
I would like to be able to print the values ??in a shortcode. I use the following code:

function post_selezionti() {
	$articoli_collegati = get_field('articoli_collegati');
	if ($articoli_collegati) {
		echo esc_html('test'.$articoli_collegati->post_title);
	}
}

add_shortcode( 'sc_post_selezionti', 'post_selezionti');

only test appears on the screen.
How do i view the post title do i have the value of the custom field?
Thanks