Novel
A hardcover novel, titled Portal: A Dataspace Retrieval and composed mostly of the text from the interactive novel with some new additions, was written by the same author, Rob Swigart and first published by St. Martin's Press in 1988. It takes the form of a series of notes on different subjects, in an order that the player would encounter them through Homer. A softcover edition was released by Backinprint.com in 2001.
An eBook was released "under the Creative Commons BY-NC-ND Unported license 3.0". It has been authorized to be uploaded here by the author himself.
Read more about this topic: Portal (interactive Novel)