Non R probability question

Dear R People:

Here is a non-R probability question, please:

There is a problem, originally posed from an American game show,
called "Let's Make a Deal."

A contestant makes a selection of one door, from Doors 1 through 3.
He or she knows that there are 2 goats and 1 car behind those doors.
Once the contestant makes the selection, say Door 2, then the host,
Monty Hall, tells him that there is a goat behind Door 1, and would
he like to stay with the original Door 2 or switch to Door 3.

There is a nice journal article dealing with this, but I can't find
the reference.  I do remember that there were pictures of goats in
the margins of the article.  (Scary).

Anyhow, does anyone have the reference, please?

Thanks in advance for any help.

Sincerely,
Erin M. Hodgess, Ph.D.