Cita APA (7a ed.)

Hildebrand, D. v., & Seifert, J. (1990). What is philosophy? (1st publ., repr.). Routledge.

Cita Chicago Style (17a ed.)

Hildebrand, Dietrich von, y Josef Seifert. What Is Philosophy? 1st publ., repr. London [etc.]: Routledge, 1990.

Cita MLA (9a ed.)

Hildebrand, Dietrich von, y Josef Seifert. What Is Philosophy? 1st publ., repr. Routledge, 1990.