Synchronized clocks programming dan interfacing part
Fakultas Teknik Universitas Indonesia, 2004
 UI - Skripsi Membership
Saunders, D.S.
Insect clocks
Pergamon Press, 1982
 Buku Teks SO
Saunders, D.S.
Insect clocks
Pergamon Press, 1982
 Buku Teks SO
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 SO