Through the knowledge he had gathered on the instrument, he collaborated on a booklet, The Appalachian Dulcimer, writing authoritatively on the subject.

There was no need to worry about her lack of knowledge: public relations trained you to write authoritatively about everything from tractors to lingerie.

Very few people can write authoritatively about what it takes to run one.

Goethe wrote authoritatively about Leonardo's painting but to some extent misguidedly, because he seems never to have seen it "live."

On that subject he writes briskly and authoritatively, and his judgments are worth reading.

He wrote authoritatively on the history of gold and silver objects.

She also became an activist who wrote authoritatively about the life of cancer patients.

"The nuclearization of the world has become the human condition, and it cannot be changed," he writes authoritatively.

For one thing, they have to compete with third-world novelists writing authoritatively about their own countries.

Hamill, who studied art in Mexico when he was a young man, writes authoritatively about Rivera's work and diverse styles.