What is the author's style in Cujo by Stephen King?

The language of this novel is simple. The language often reflects the education and nature of the characters. When Aunt Evvie is speaking, the language appears in bold text, expressing the loudness with which old deaf Aunt Evvie speaks. When the mailman speaks, his language is often crude, as is the language of Joe Camber and his friend Gary Pervier. With the Trentons, however, the language becomes less crude and more educated, reflecting the college education both Vic and Donna were lucky enough to receive.