How to make an origami cube with four kites

(page 11)

19th picture of origami cube with four kites

19.

Start applying both four "valley-folds" and four "mountain-folds" of the step #17.

20th picture of origami cube with four kites

20.

Continue applying both four "valley-folds" and four "mountain-folds" of the step #17.

If you have a difficulty in these steps, you are welcome to write a question below.