SAS:

• SAS OnlineDoc 9 - SAS Institute
• SAS Introduction - Princeton University
• SAS Resources - UCLA
• SAS for Windows and the Analyst Application - University of Texas
• SAS for UNIX Tutorial - University of Texas
• SAS Tutorial for UNIX - University of New Mexico

SPSS:

• SPSS Resources - UCLA
• SPSS for Windows: Getting Started - University of Texas
• SPSS Tutorial - Texas A&M
• Guide to SPSS - Harvard-MIT Data Center
• Getting Started with SPSS for Windows - Indiana University
• Getting Started with SPSS for Unix - Indiana University
• SPSS Under Unix
• SPSS 12: Data Analysis Basics - Northern Illinois University

Stata:

• Resources for learning Stata - Stata.com
• Stata Tutorial - Carolina Population Center
• Stata Tutorial - Princeton University
• Another Princeton Stata Tutorial
• Stata Resources - UCLA
• Getting Started with Stata for MS Windows - Robert Yaffee, Academic Computing Services, NYU
• Introduction to Stata - Jeroen Weesie, Dept. Sociology, Utrecht University

Other Documentations and Resources:

• Data Analysis
• A Dictionary of Statistics
• A Dictionary of Social Sciences
• A Dictionary of Economics
• A Dictionary of Sociology
• A Dictionary of World History