- On Austrian Soil: Teaching Those I Was Taught To Hate by Sondra Perl, 2005-03-10
- Randal Schwartz's Perls of Wisdom by Randal Schwartz, Apress, 2004-12-14
- Practical Text Mining with Perl (Wiley Series on Methods and Applications in Data Mining) by Roger Bilisoly, 2008-08-18
- Perl: Annotated Archives by Martin C. Brown, 1999-01-07
- Perl Programming for Medicine and Biology (Series in Biomedical Informatics) by Jules J. Berman, 2007-04-06
- Analyzing Computer System Performance with Perl::PDQ by Neil J. Gunther, 2010-11-02
- Perl 6 and Parrot Essentials, Second Edition by Allison Randal, Dan Sugalski, et all 2004-06
- Wicked Cool Perl Scripts: Useful Perl Scripts That Solve Difficult Problems by Steve Oualline, 2006-02-15
- Pro Perl by Peter Wainwright, 2005-03-24
- Genomic Perl: From Bioinformatics Basics to Working Code by Rex A. Dwyer, 2002-07-15
- Gestalt Therapy by Frederick Perls, 1951
- Gestalt Therapy: Excitement and Growth in the Human Personality by M.D., Ph.D. Frederick S. Perls, Ph.D. Ralph F. Hefferline, et all 1994-02-10
- Advanced Perl Programming by Sriram Srinivasan, 1997-08
- Network Programming with Perl by Lincoln D. Stein, 2001-01-06
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