The article, written by writer and editor Ryan Joe, lists some of the companies that offer the service and what that comprises, pointing out that audio editions can be hard to sell.
The Audiobook Creation Exchange (ACX) is one place to find narrators, producers and distributors for audio books, and ACX connects with Amazon, Audible and iTunes.
Another option is Deyan Audio Services, which has more than 1,000 actors on its books. (This is a US company.) The company offers complete audio book production or editing and mastering services.
Dog Ear Publishing offers a service where the author reads his or her own work, providing the editing and mastering services in house, as well as ISBN and distribution services. Again, this is a US company.
To find a narrator, the article suggests picking out a five to seven-minute sample (1,000 words) which features dialogue between key characters.
For authors in the UK, the website indiesunlimited has useful advice about software for a DIY version of an audio book - GarageBand offered by iTunes is recommended by many authors, and Propaganda.
For those with a very small budget, indiesunlimited recommends Audacity software which can be downloaded for free.
The website offers instructions for how to record your own audio book.