write on *
write of
write about **

He wrote four books on his time in the company.

They wrote a books on China together in 1964, 1979 and 1980.

He also wrote a book on the history of the church.

He wrote three books on the area and its history.

He also wrote several books on his life and art.

All you'll get to read is what you write on the wall.

Later in life he wrote on the subject through many of his books.

Now he is writing a book on his years in the Government.

She turned back to see the teacher writing quickly on a piece of paper.

He wrote several books on the early history of Florida.