What is the complete version of the paper: "How to Generate and Exchange Secrets (extended abstract)" by Andrew Yao?
Garbled circuits were only implied by the extended abstract. They were only explicitly introduced in the talk given by Andrew Yao at the conference.

This is clear from a footnote on the Turing Award Page:


  The first of these two papers introduces secure function evaluation, and gives a > protocol for the famous Millionaires’ Problem. In talks related to these papers > Yao introduced a technique for secure computation known as garbled circuits.


which may be found here: http://amturing.acm.org/bib/yao_1611524.cfm#bib_6

Credit is due to Wandering Logic for giving this very helpful answer in the comments above.