Citazione Stile APA (7a Edizione)
Richards, R. J. (2008). The tragic sense of life: Ernst Haeckel and the struggle over evolutionary thought. University of Chicago Press.
Citazione stile Chigago Style (17a edizione)
Richards, Robert J. The Tragic Sense of Life: Ernst Haeckel and the Struggle over Evolutionary Thought. Chicago: University of Chicago Press, 2008.
Citatione MLA (9a ed.)
Richards, Robert J. The Tragic Sense of Life: Ernst Haeckel and the Struggle over Evolutionary Thought. University of Chicago Press, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.