Structural Linguistics by Harris, Zellig cortesía de la Universidad de California: http://archive.org/details/structurallingui00harr
Lectures on The Science of Language by Max Mueller: http://www.gutenberg.org/catalog/world/readfile?fk_files=1722831&pageno=1
Introduction to Linguistics by Edward Stabler - UCLA 2010:
http://www.linguistics.ucla.edu/people/stabler/20.pdf
