Preparing to write the Language Proficiency Index (LPI) - 2014 EditionPreparing to write the Language Proficiency Index - 2010 EditionGuide to the Language Proficiency Index (LPI) essay - 2011 EditionThe LPI workbook : eight practice tests for the language proficiency index (LPI) - 2009 EditionThe LPI workbook two - 2000 EditionThe complete LPI guide and workbook : everything you need to know to do well on the LPI test - 2008 Edition