Ulrich Renz 
Sofðu rótt, litli úlfur – راحت بخواب، گرگ کوچک (íslenska – persneska / dari) [EPUB ebook] 
Tvímála barnabók

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.