Dame Mary Barbara Hamilton Cartland, DBE, CStJ was an English novelist who wrote romance novels, one of the best-selling authors as well as one of the most prolific and commercially successful worldwide of the 20th century.
She wrote more than 700 books, as well as plays, music, verse, drama, magazine articles and operetta, and was a prominent philanthropist. She reportedly sold more than 750 million copies, though other sources estimate her total book sales at more than two billion copies.
I remember one piece of advice I was given about selling books is that you have to prove that you can produce more than one book. Apparently gone are the days of the one book wonder propelling you to a household name.
The most published works by one author is 1,084 by L. Ron Hubbard (USA) whose first work was published in February 1934 and the last in March 2006.
According to Guinness World Records as of 1995, the Bible is the best–selling book of all time with an estimated 5 billion copies sold and distributed.