Deiss, L. (1979). The essential question. World Library Publications.
Cita Chicago Style (17a ed.)Deiss, Lucien. The Essential Question. Chicago: World Library Publications, 1979.
Cita MLA (8a ed.)Deiss, Lucien. The Essential Question. World Library Publications, 1979.
Precaución: Estas citas no son 100% exactas.