Solomon, R. C., & Higgins, K. M. (2014). The Big questions: A short introduction to philosophy (Ninth edition, International edition.). Wadsworth Cengage Learning.
Citazione stile Chigago Style (17a edizione)Solomon, Robert C., e Kathleen Marie Higgins. The Big Questions: A Short Introduction to Philosophy. Ninth edition, International edition. Australia: Wadsworth Cengage Learning, 2014.
Citatione MLA (9a ed.)Solomon, Robert C., e Kathleen Marie Higgins. The Big Questions: A Short Introduction to Philosophy. Ninth edition, International edition. Wadsworth Cengage Learning, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.