How can I get a list of users by their role?

There may be some different way to do that, but most proper way to do that is following.

<?php

$args = array(
    'role'    => 'Your desired role goes here.',
    'orderby' => 'user_nicename',
    'order'   => 'ASC'
);
$users = get_users( $args );

echo '<ul>';
foreach ( $users as $user ) {
    echo '<li>' . esc_html( $user->display_name ) . '[' . esc_html( $user->user_email ) . ']</li>';
}
echo '</ul>';

?>