Ulrich Renz 
Ngủ ngon, Sói con yêu – Śpij dobrze, mały wilku (tiếng Việt – t. Ba Lan) 
Sách thiếu nhi song ngữ

Sách thiếu nhi song ngữ (tiếng Việt – t. Ba Lan)
Tim không thể ngủ được. Con chó sói nhỏ đã biến mất! Có thể cậu bé đã để quên nó ở ngoài sân chơi? Một mình Tim đi tìm sói nhỏ trong đêm và không ngờ lại gặp nhiều bạn khác…
Dwujęzyczna książka dla dzieci od 2 lat (wietnamski – polski)
Tim nie może zasnąć. Zaginął jego mały wilk. Być może zostawił go na zewnątrz? Tim wyrusza samotnie w noc – i niespodziewanie napotyka przyjaciół…
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Mengenai Pengarang

Ulrich Renz was born in Stuttgart, Germany, in 1960. After studying French literature in Paris he graduated from medical school in Lübeck and worked as head of a scientific publishing company. He is now a writer of non-fiction books as well as children's fiction books.
Barbara Brinkmann was born in Munich in 1969 and grew up in the foothills of the Bavarian Alps. She studied architecture in Munich and is currently a research associate in the Department of Architecture at the Technical University of Munich. She also works as a freelance graphic designer, illustrator, and author.