Question

I want to use the term "head fake" in my paper. This term came from Randy Pausch from his movie called "The Last Lecture." How do I cite this.

Answer 1

MLA or APA?

Answer 2

What's the context? If this is a legit term, you can use it without making reference to any other particular person's use of it. If you think your audience will not understand it (and as this is a specialized term, they well might not), then define it within the sentence in some way.

If your use of it has some direct relationship to the use Pausch makes of it in his lecture, then you will explore (in depth) or explain (briefly) that use in your text. The lecture has been published. You can then cite the book itself as the source as you would any other published book.