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sub ReadSource( $ $ )
{
...
        }
    }
}

  my %myhash = ();  # empty hash
  my @Data = ( 'this', 'that', 'that over there' );
...
  my $datasource = 'banana';

  ReadSource( $datasource, \%myhash );

  use Data::Dumper;

  ReadSource( $datasource, \%myhash );
  print( Dumper( \%myhash ) . "\n" );

$VAR1 = {
          'this' => [
...
                                 'banana'
                               ]
        };