Gharib, S. (1997). Inscriptions on Time. The Egyptian General Book Authority, p. 72.
Hussein, K. Y., and Kohler, J. (1995). Ancient Eastern Thought. The World of Knowledge, The National Council for Culture, Arts and Letters in Kuwait, p. 9.
Myers, B. (n.d.). Fine Arts and How We Taste Them (translated by S. Al-Mansouri and M. Al-Qadi). Nahdet Misr Library, p315.