Хуан Линц о президентской системе
"The Failure of Presidential Democracy: Comparative Perspectives" by Juan J. Linz (Editor), Arturo Valenzuela (Editor)

"The Failure of Presidential Democracy: The Case of Latin America" by Juan J. Linz (Editor), Arturo Valenzuela (Editor)

JUAN LINZ, PRESIDENTIALISM, AND DEMOCRACY: A CRITICAL APPRAISAL
Scott Mainwaring and Matthew Shugart
Working Paper #200 - July 1993
http://www.nd.edu/~kellogg/WPS/200.pdf

И вообще - working papers of The Kellogg Institute
http://www.nd.edu/~kellogg/public.html#wps

Заодно - страница Артуро Валенсуэло в Джорджтауне
http://www.georgetown.edu/sfs/programs/clas/profs/av/avframes.htm

Его публикации - http://www.georgetown.edu/sfs/programs/clas/profs/av/avlib.htm

В том числе "The Crisis of Presidentialism in Latin America":
по-английски - http://www.georgetown.edu/sfs/programs/clas/profs/av/linzfest.htm
по-русски - http://www.russ.ru/antolog/predely/2-3/dem10.htm

Еще статьи, линки на которые не раскрыты с его страницы, но которые видны из http://www.georgetown.edu/sfs/programs/clas/profs/av -

THE AMERICAS
http://www.georgetown.edu/sfs/programs/clas/profs/av/freedom2.html

NEW CHALLENGES TO UNITED STATES FOREIGN POLICY. The U.S.-Mexico Bilateral Relationship
http://www.georgetown.edu/sfs/programs/clas/profs/av/mexic10.htm

PARAGUAY: THE COUP THAT DIDN'T HAPPEN
http://www.georgetown.edu/sfs/programs/clas/profs/av/paraguay.htm

UNITED STATES AND EXTERNAL ACTORS IN THE TRANSITIONS TO DEMOCRACY IN THE WESTERN HEMISPHERE
http://www.georgetown.edu/sfs/programs/clas/profs/av/smu3.htm