Ragep, F. Jamil (2001a). "Tusi and Copernicus: the Earth's motion in context". Science in Context. 14 (1–2). Cambridge University Press: 145–63. doi:10.1017/S0269889701000060. S2CID145372613.
Ragep, F. Jamil (2001a). "Tusi and Copernicus: the Earth's motion in context". Science in Context. 14 (1–2). Cambridge University Press: 145–63. doi:10.1017/S0269889701000060. S2CID145372613.