Pieper, A., & Thurnherr, U. (1994). Was sollen Philosophen lesen? E. Schmidt.
Cita Chicago Style (17a ed.)Pieper, Annemarie, y Urs Thurnherr. Was Sollen Philosophen Lesen? Berlin: E. Schmidt, 1994.
Cita MLA (8a ed.)Pieper, Annemarie, y Urs Thurnherr. Was Sollen Philosophen Lesen? E. Schmidt, 1994.
Precaución: Estas citas no son 100% exactas.