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my @bookIDList = qw(abc ghj zxc bnm qwe rty iop sdf ert);
my $param = = {
                 IDs => [ @bookIDList ],

my $param = = {
                 IDs => \@bookIDList,

my $param = = {
                 IDs => [ qw(abc ghj zxc bnm qwe rty iop sdf ert) ], 
                 sort => "AUTHOR",
                 maxResults => 100
              };