Programming Perl - covers Perl 5, 2nd Edition. - Larry Wall; Tom Christiansen; Randal L. Schwartz (O'Reilly, 1996)

Learning Perl (2. ed.). - Randal L. Schwartz; Tom Christiansen (O'Reilly, 1997)

Learning Perl on Win32 systems - Perl programming for Win32, Windows NT. - Randal L. Schwartz; Erik Olson; Tom Christiansen (O'Reilly, 1997)

Perl cookbook - solutions and examples for Perl programmers. - Tom Christiansen; Nathan Torkington (O'Reilly, 1998)

Programming Perl - there's more than one way to do it (3. ed.). - Larry Wall; Tom Christiansen; Jon Orwant (O'Reilly, 2000)

Perl cookbook - solutions and examples for Perl programmers (2. ed.). - Tom Christiansen; Nathan Torkington (O'Reilly, 2003)

Advanced Perl. - Tom Christiansen (USENIX ATC, 2007)

Fast and simple semantic class assignment for biomedical text. - K. Bretonnel Cohen; Tom Christiansen; William A. Baumgartner Jr.; Karin Verspoor; Lawrence Hunter (BioNLP@ACL, 2011)

MetaMap is a Superior Baseline to a Standard Document Retrieval Engine for the Task of Finding Patient Cohorts in Clinical Free Text. - K. Bretonnel Cohen; Tom Christiansen; Lawrence E. Hunter (TREC, 2011)

Programming Perl - Unmatched power for text processing and scripting: covers Version 5.14, 4th Edition. - Tom Christiansen; Brian D. Foy; Larry Wall (O'Reilly, 2012)

BioLemmatizer: a lemmatization tool for morphological processing of biomedical text. - Haibin Liu; Tom Christiansen; William A. Baumgartner Jr.; Karin Verspoor (J. Biomed. Semant., 2012)