There has been data ("誰も教えてくれない「デリヘル」商売の始め方・儲け方―1番人気の風俗ビジネス“デリバリーヘルス” - ISBN-13 978-4-89386-947-0") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Wed Feb 5 04:45:45 2020, so the data displayed here has been removed .