Where can I find the article about the Turing Test?

Alan Turing's article "Computing Machinery and Intelligence" appeared in the October, 1950 issue of the Philosophical Journal Mind.

To get a copy of the article, all you need to do is to go to the Mind Journal's website. Then, in the Search Box, type "Author Turing". It will take you to a webpage where, if you click on the title "COMPUTING MACHINERY AND INTELLIGENCE", it'll take you to another webpage, where you can click on the PDF icon to download a PDF copy of Alan Turing's paper.

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As an alternative, may I suggest looking into the book "The Essential Turing" edited by B. Jack Copeland (Oxford University Press, 2013). You can find a complete copy of Turing's 1950 paper in this book as well.

This is a book that is definitely worth perusing, and then selectively reading those parts that most interest you. Not only does it have Turing's landmark accomplishments such as his 1936 paper in which he introduced to the world his famous Turing Machine, or a history of how he cracked the German Enigma during World War II, or his 1950 paper in which he introduced to the world his famous Turing Test; but it includes other matters of interest, such as written recordings of radio programs from the 1950's where Turing expressed his views on whether machines could think, some letters Turing wrote to his friends, Turing's interest in biology, and other matters. Every chapter is accompanied with a commentary by the editor, B. Jack Copeland, and this also helps.

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Compared with some of the other papers that Alan Turing published (such as the 1936 paper in which he described the Turing Machine), this one (where he describes the Turing Test) is very easy to read. That's because it doesn't have the mathematical rigor that is required for certainty and correctness. It also means, that the arguments that Turing presents are not mathematical theorems that cannot be refuted, but merely very strong arguments. As such, they are vulnerable to criticisms, and in fact have been opposed and debated by some cognitive scientists, philosophers, and others.