Instead of citing exact sales figures, you could also mention whether your book turned a profit for you. (selfpublishingrelief.com)
The company never divulges exact sales figures, so there is really no factual data to backup their wiley claims. (goodereader.com)
The company is privately held and won't release exact sales figures, but Hummer sales have increased from a few hundred a year since the civilian version came out in 1991 to just over a thousand last year, according to Automotive News. (articles.orlandosentinel.com)