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I am not quite sure what you mean by original sources in this context. 
The earliest paper that I know in which Lucas contrasts the adaptive 
expectations version of the Phillips curve with the rational expectations 
version is "Econometric Testing of the Natural Rate Hypothesis" in a 
Board of Governors of the Federal Reserve System conference volume 
entitled The Econometrics of Price Determination.  This is reprinted in 
Lucas's Studies in Business Cycle Theory and in Hoover (ed.) The New 
Classical Macroeconomics (Elgar), and possibly elsewhere.  Earlier than 
that, you might find Lucas and Rappings papers in JPE 1969 and AER 1969 
helpful.  The history of the new classical approach to the Phillips curve 
is recounted in a number of places, including chapter 2 of my The New 
Classical Macroeconomics (Blackwell - rather confusingly titled the same 
as the Elgar anthology.) 
 
Kevin Hoover 
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