Canning, Joseph
A history of medieval political thought 300-1450 /Joseph Canning
Routledge, 1996
 Buku Teks
Hayeh, L. Newton
Great wall of China
Shanghai: Kelly & Walsh, 1937
 Buku Teks
Synchronized clocks
Fakultas Teknik Universitas Indonesia, 2004
 UI - Skripsi (Membership)
Saunders, D.S., author
Insect clocks
Pergamon Press, 1982
 Buku Teks
China briefing, 1991/Edited by William A. Joseph
Boulder Westview Press 1992,
 Buku Teks
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