Gaya APA

Higgins, K, M., Solomon, R. (2006). The Big Questions: A Short Introduction to Philosophy (Ninth Edition). Belmont, California, USA: Wadsworth Cengage Learning.

Gaya MLA

Higgins, Kathleen, M.., Solomon, Robert. "The Big Questions: A Short Introduction to Philosophy". Ninth Edition Belmont, California, USA: Wadsworth Cengage Learning, 2006. e-book.