cant able to select values from custom table using wordpress plugin

We created a new plugin and anew table.we cant take back the values from the table.We can take back the values from other tables, that already in WordPress.
PLZ HELP
the code is
function displayWorks() {
global $wpdb;
$recentworks = $wpdb->get_results( “SELECT * FROM $wpdb->works”,ARRAY_A);
print_r( $recentworks );
}