Adler, P. J., & Pouwels, R. L. (2018). World civilizations (Eighth edition.). Cengage Learning.
Cita Chicago (17th ed.)Adler, Philip J., i Randall Lee Pouwels. World Civilizations. Eighth edition. Australia: Cengage Learning, 2018.
Cita MLA (9th ed.)Adler, Philip J., i Randall Lee Pouwels. World Civilizations. Eighth edition. Cengage Learning, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.