Complete Perl programming
5.0(3)Business Analysis Process Model
5.0(10)PMI-RMP Exam Prep: In-House Training
Total QoS for engineers
5.0(3)Definitive Salt for engineers
5.0(3)Linux system administration (LPIC-1)
5.0(3)UNIX system administration
5.0(3)Drill String Design & Drilling Optimization