Adler, P. J., & Pouwels, R. L. (2015). World civilizations (Seventh edition, student edition.). Cengage Learning.
Citazione stile Chigago Style (17a edizione)Adler, Philip J., e Randall Lee Pouwels. World Civilizations. Seventh edition, student edition. Stamford, Connecticut: Cengage Learning, 2015.
Citatione MLA (9a ed.)Adler, Philip J., e Randall Lee Pouwels. World Civilizations. Seventh edition, student edition. Cengage Learning, 2015.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.