Kyrgyz vowel harmony

I have been studying Kyrgyz for a year now.
But it still takes time to learn these words.

This is my Kyrgyz reference book.
The grammar is similar to Japanese.
As I am Japanese, grammar is easy to study.


However, I am currently having some difficulties learning this Kyrgyz language.

One of them is called "vowel harmony".
I can't do this easily.

I seem to have a unique vowel harmony in Kyrgyzstan, and it takes time to master it.
Moreover, there is only one reference book in Kyrgyz in Japan.


I would like to know if there is a reference book in Kyrgyz where you can study in English.