The Presidential Secretariat , 1992
Buku Teks
edited by Emma Beare, contributing Cathy Lowne
Bounty Books, 2013
Buku Teks
Dowis, Richard
[American Management Association, ], 2000
eBooks
Birkett, Lord
Penguin Books, 1961
Buku Teks
Faradilla Rara Subianto
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2022
UI - Tugas Akhir