Principles of Macroeconomics (LibreTexts)

Principles of Macroeconomics (Skills Commons)

Principles of Macroeconomics - 3e

Principles of Macroeconomics(Georgia Tech)

Principles of Microeconomics (adaptation of OpenStax textbook)

Principles of Microeconomics (Curtis and Irvine)

Principles of Microeconomics 2.0

Principles of Microeconomics 3e

Principles of Public Speaking

Project Gutenberg

Project Gutenberg

Psychology (Galileo Open Learning Materials)

Psychology (LibreTexts)

Psychology - 2e

Psychology as a Biological Science

Psychology as a Social Science

Public Speaking (The Public Speaking Project)

Public Speaking and Communication Free and Open Textbooks and Courses

Research Methods in Psychology - 4th American Edition

Research Strategies for College Students

Smithsonian Open Access

Sociology (Alamo Colleges)

Sociology Vibes

Sociology: Understanding and Changing the Social World