Poincaré, H. (1996). Natural science: Selections from the twentieth-century (2nd ed., 6th print.). Encyclopædia Britannica.
Chicago-Zitierstil (17. Ausg.)Poincaré, Henri. Natural Science: Selections from the Twentieth-century. 2nd ed., 6th print. Chicago: Encyclopædia Britannica, 1996.
MLA-Zitierstil (9. Ausg.)Poincaré, Henri. Natural Science: Selections from the Twentieth-century. 2nd ed., 6th print. Encyclopædia Britannica, 1996.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.