Armstrong, Kenneth A.
Brexit time = Leaving the EU - Why, How and When?
Cambridge University Press, 2017
 eBooks
Purnomo Yusgiantoro
The footprints of time: menapak waktu
[Publisher not identified], 2009
 Buku Teks SO
Mengelola waktu = The management of time
editor, A. Dale Timpe
Elex Media Komputindo, 2000
 Buku Teks SO
Mengelola waktu = The management of time
editor, A. Dale Timpe
Elex Media Komputindo, 1991
 Buku Teks SO
Spillane, James J.
Time management : pedoman praktis pengelolaan waktu
Kanisius, 2003
 Buku Teks SO