In this community question asking about books that teach the practice of mathematics, the author mentions the works of W W Sawyer.

Which of Sawyer's books were translated into languages other than English?

His Wikipedia page states that his books Mathematician's Delight and Prelude to Mathematics "have been translated into many languages", but I have been unable to find publication details for any non-English language edition of even a single book of his. The cited source is an article by Ailsa Ferguson published by the University of Toronto which is no longer at the address linked to.