What is the correct name of the book about 003 1/2 James Bond Junior?

What ist he correct title for R.D. Mascott’s book? Is it 003 1/2: The Adventures of James Bond Junior or 003 1/2 The Adventures of James Bond Junior?

My copy seems to have the 003 1/2 first and The Adventures of James Bond Junior as a subtitle. Other editions seem to have it the other way around.

Is there a definitive answer?