public string ConstructBookReviewsUrl(string isbn, int startIndex, int maxResults)
{
string bookReviewsUrl = isbnBookBaseUrl;
bookReviewsUrl += isbn;
bookReviewsUrl += "/reviews?";
bookReviewsUrl += "&start-index=" + startIndex.ToString();
bookReviewsUrl += "&max-results=" + maxResults.ToString();
bookReviewsUrl += "&apikey=" + apiKey;
return bookReviewsUrl;
}