index.js
function campaignStatByReferrals(callback,id){
    if (id===undefined) {
        return callback(returnError('Empty book id'));
    }
    sendRequest( 'campaigns/' + id + '/referrals', 'GET', {}, true, callback );
}
function campaignStatByReferrals(callback,id){
    if (id===undefined) {
        return callback(returnError('Empty book id'));
    }
    sendRequest( 'campaigns/' + id + '/referrals', 'GET', {}, true, callback );
}
Get campaign statistic by referrals

@param callback
@param id