He has also authored opinion pieces on the subject.

Very soon she authored a book on the same subject.

He authored eight books and hundreds of articles on the subject of singing.

He authored several books and scientific articles, mostly on the subject of cardiovascular disease.

During his career he was a popularizer of astronomy and authored many books on the subject.

He had a great interest in the early days of aviation and authored two books on the subject:

He has authored several books on the subject of Irish history.

In 2011 Brown authored a book on the subject.

So far he has authored 11 books on the subject, all in Hindi.

He also authored many books on the subject of Chinese missionary work.