Kinsella, Sophie
Jangan bilang-bilang ya... = can you keep a secret
Gramedia Pustaka Utama, 2003
 Buku Teks
Locke, A.
The tigers of Trengganu
The Malaysian Branch of the Royal Asiatic Society, 1993
 Buku Teks
Ruwantissa Abeyratne
Asean single aviation market and indonesia - can it keep up with the giants? / Ruwantissa Abeyratne
University of Indonesia, Faculty of Law, 2014
 Artikel Jurnal
Zemke, Ron
E-Service : 24 ways to keep your customers-when the competition is just a click away
Amacom, 2000
 Buku Teks
Temperley, Alison
Inside knowledge: how women can thrive in professional service firms
Emerald, 2017
 eBooks