Nelson Mandela's former private secretary Zelda la Grange's book "Good Morning, Mr Mandela" is the best selling book of 2014, according to a Sunday news report.
Rapport reported that since June the book had sold about 11,000 copies per month. In South Africa the book sold more than 50,700 copies.
According to the report, this meant a gross income of about R15 million before tax and discounts to shops.
The Afrikaans version of the book has sold 20,000 copies.
Professor Tim Noakes's book about banting diet recipes has sold a total of 116,000 English copies and 13,300 Afrikaans copies since November 2013.
Rapport said this was according to figures published by Nielsen and was based on sales at various bookshops.
In her book Le Grange writes of former president Mandela's meetings with various celebrities including Oscar-winning actress Charlize Theron and "Top Gear" presenter Jeremy Clarkson.
She also wrote about how Mandela was treated by state doctors before his death on December 5 last year.
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