What is the author's style in Favorite Folktales from Around the World by Jane Yolen?

The language in the story changes with each culture that is looked at. Some of the language is much more stiff and formal. In many of these, there are noble people or deities talking. In other stories the language is very informal and common place. There are also creatures and people that seem to be ignorant or of low intelligence. These characters will speak differently than others. There are some creatures that only speak in rhyme and verses. The reason for this may be to make them seem different from humans. This trait is seen in both magical creatures and those that are dead.