Richards, E. (1998). Mapping time: The calender and its history. Oxford University.
استشهاد بنمط شيكاغوRichards, E.G. Mapping Time: The Calender and Its History. New York: Oxford University, 1998.
MLA استشهادRichards, E.G. Mapping Time: The Calender and Its History. Oxford University, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.