Cross-tool communication: from protocol authoring to eligibility determination. - John H. Gennari; David Sklar; John S. Silva (AMIA, 2001)

PHP cookbook - solutions and examples for PHP programmers. - David Sklar; Adam Trachtenberg (O'Reilly, 2002)

Learning PHP 5 - a pain-free indroduction to building interactive web sites. - David Sklar (O'Reilly, 2004)

PHP cookbook - solutions and examples for PHP programmers: covers PHP 5 (2. ed.). - David Sklar; Adam Trachtenberg (O'Reilly, 2006)