how to amazon autocomplete scopes to books

I am using Amazon auto-complete suggestions in my site. It is working well but I want to scope it only for books.My code as following

$(document).ready(function () {
    jQuery('input.autocomplete').autocomplete({
        source: function (request, response) {
            jQuery.ajax('http://ift.tt/1d55rlk', {
                cache: true,
                data: {
                    client: 'amazon-search-ui',
                    mkt: 1,
                    'search-alias': 'aps',
                    q: request.term
                },
                error: function () {
                    response([]);
                },
                success: function (data) {
                    response(data[1]);
                },
                dataType: 'jsonp'
            });
        }
    });
});

This code is working on autocomplete css class. If you know something about this please let me know.