The language combination Bulgarian - Yiddish is not (yet) available for the book "Sleep Tight, Little Wolf".
You might be lucky, though, by changing the order of these two languages. Just go back to the Language Wizard and select Yiddish as first and Bulgarian as second language:
If this doesn't help, shoot me an e-mail to enquire about the availability of the title, by clicking this link: order@childrens-books-bilingual.com
If the message doesn't open automatically in your email programme, send an email to 'order@childrens-books-bilingual.com' with the subject heading:
Availability of: Спи добре, малко вълче (Bulgarian-Yiddish)