Zero or more.
100 thousand
The 2003 edition of the book says "over 2 million copies sold"
Billions
For every hardback book, there are nine paperback books.
The Lightning Thief has sold the most copies at more than 1.2 million copies.
The number of copies sold for the book is not specified.
The book has sold over one million copies.
The book sold 10,000 copies in the first week of its release.
1000 copies have been sold
The number of book copies sold is not provided in the text.
For each book over 1 million copies have been sold.
Don Quixote by Miguel de Cervantes Another Answer: Though the above book had many copies sold, particularly in Spain, no book has sold more copies than the Bible in the history of literature.
17 million
100 thousand
Over 50 million copies of "The Secret Garden" book have been sold worldwide since its publication in 1911.
To find out how many copies of a book were sold, you can check with the publisher, look for sales data from industry sources like Nielsen BookScan, or contact the author or their agent for information on book sales.
Joey Graceffa's book "In Real Life" has sold over 100,000 copies since its release in 2015.