Gilbert, W., Galilei, G., & Harvey, W. (1996). On the loadstone and magnetic bodies (2nd ed., 6th print.). Encyclopædia Britannica.
Citazione stile Chigago Style (17a edizione)Gilbert, William, Galileo Galilei, e William Harvey. On the Loadstone and Magnetic Bodies. 2nd ed., 6th print. Chicago: Encyclopædia Britannica, 1996.
Citatione MLA (9a ed.)Gilbert, William, et al. On the Loadstone and Magnetic Bodies. 2nd ed., 6th print. Encyclopædia Britannica, 1996.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.