Originally published in 1990-1991, Types of Play, by Evan Robinson, is a short article with some insights on computer games and non-games as well.
"I believe we are trying to categorize the wrong thing. I suggest that the critical element in our taxonomy is the way users interact with entertainment products, not whether or not the product has sub-systems that 'anticipate' the user's moves. In addition, we are attempting to overlay new meaning on words that have common usage, which will invariably result in confusion both among ourselves and among our users."
Check the whole article at Chris Crawford's Library