1. Edward Sapir
http://emuseum.mnsu.edu/information/biography/pqrst/sapir_edward.html
http://en.wikipedia.org/wiki/Edward_Sapir
http://www.columbia.edu/cu/anthropology/about/main/one/sapir.html
http://www.bartleby.com/people/Sapir-Ed.html
http://www.answers.com/topic/edward-sapir
http://www.gutenberg.org/etext/12629

 2. Franz Boas 
http://emuseum.mnsu.edu/information/biography/abcde/boas_franz.html
http://en.wikipedia.org/wiki/Franz_Boas
http://astro.temple.edu/~ruby/ruby/boas.html
http://www.amphilsoc.org/library/mole/b/boas.htm
http://www.columbia.edu/cu/anthropology/about/main/one/boas.html
http://www.nndb.com/people/861/000097570/　

 3. Leonard Bloomfield
 http://cognet.mit.edu/MITECS/Entry/langendoen
 http://www.xrefer.com/entry/441234
 http://en.wikipedia.org/wiki/Leonard_Bloomfield
http://www.britannica.com/eb/article-9015721/Leonard-Bloomfield
http://siris-archives.si.edu/ipac20/ipac.jsp?uri=full=3100001~!87125!0&term=#focus

4. Levels in American Structuralist phonology                                                                
http://www.phon.ox.ac.uk/~jcoleman/rules.htm

5. Characterizations of American Structuralism
http://www.fleric.org/forum/archiver/?tid-368.html