Here's a cover image of my book on vi.

The book received precisely one review on amazon.com
(five-star) by Ganesh Nagarajan from Tamil Nadu, India:
"thanks for such a guide, that is unbelivable for me to get it."
Thank you, Ganesh!

Keigaku Publishing produced a nicely-designed
Japanese translation of the book, with this cover.

Garrett Hildebrand, who was among those complimentary
about my vi book, has a great page of information about vi.

My vi quick reference booklet is available for sale from me.