How to make a 16 page mini note book by cutting and folding a A4-size sheet of paper

Ialways carry a 16-page note book which I make from an A4 sheet of paper in my shirt for taking down instant notes. I learned how to make the small note book after watching an YouTube origami video clip.

Someone who is interested asked me to post a picture of the note book online. I am pleased to add an instructional video clip here for your reference. 

The video clip teaches you how to fold the booklet in landscape format in a few easy steps. After experimenting a few times I have learned how to make the mini note book in portrait format as well.