public async Task <IEnumerable <Book> > SearchBooksByAuthor(SearchAuthorDto search)
{
var author = _queryHelper.Encode(search.Author);
var orderBy = _queryHelper.GetOrderBy(search.OrderBy);
var url = _queryHelper.GetAuthorUrl(author, orderBy, search.MaxResults);
var result = await _searchRunner.PerformSearch(url);
return(_searchMapper.MapBooks(result));
}