I hear him saying about his 73 books all the time, and one day I did ask him about his 73 books and where can I find them, he said that all his books are available in PDF format and you referred me some cheap website. After digging into the website, I found about eight (8) images, each one says: Sale Price 99 Cents

Yes, each of those so-called books was for 99 cents (Pages: 5-12 pages each). I tried to find ISBN number on each PDF and couldn’t fine anything.

Later I asked him about 73 books and their ISBN number. His answer was the funniest answer I got. He said: I do have ISBN numbers for all of my books, but they are in Egypt.

In fact he replied this message on WhatsApp and I still this message to this day and every time, I look at it, I can’t stop laughing.

Note:
ISBN is an international book number, ISBN is must for every book in the world (Arabic, English, Chinese, Etc.) and it’s published in side cover of each book.