It seems you're asking for the ISBN of an author, Leonard T. Miller. ISBNs (International Standard Book Numbers) are assigned to specific books, not authors. To find the ISBN of a book written by Leonard T. Miller, you'll need to know the title of the book.
To help you find the ISBN, please tell me:
* The title of the book you're looking for.
* Any additional information you know about the book, like the publication year or publisher.
Once you provide this information, I can help you find the ISBN.