Hi @Henri BONDAR
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, looks like you are missing Bibliography styles.
I found an article might help you.
All but two bibliography styles are missing from MS office word; what - Microsoft Community
First, press Windows + R, paste in %appdata%\Microsoft\Bibliography/Style
You'll see a folder like this. Select the one that appears in Word (APA and MLA)
Open with Notepad and find this <xsl:when test="b:Version"> by using Ctrl + F.
Copy the middle block code and paste it into the missing ones. Change the name APA to the name of the reference style.
<xsl:when test="b:OfficeStyleKey">
<xsl:text>APA</xsl:text>
</xsl:when>
Save and close it. Open Word again. It should appear like usual.
I hope this information helps.
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