Synchronized clocks programming dan interfacing part
Fakultas Teknik Universitas Indonesia, 2004
 UI - Skripsi Membership
Saunders, D.S.
Insect clocks
Pergamon Press, 1982
 Buku Teks
Christopher Mohan Chugani
Remote synchronized clock
Fakultas Teknik Universitas Indonesia, 2005
 UI - Skripsi Membership
Aveni, Anthony
Empires of time: calendars, clocks and cultures
Tauris Parke Paperbacks, 2000
 Buku Teks
Briggs, William
Ants, bikes, and clocks: problem solving for undergraduates
Society for Industrial and Applied Mathematics, 2005
 eBooks