Valerie Freeman, Rebecca Freeman
Chandos Publishing, 2017
Buku Teks
under the editorship of Sven Plovgaard, Oliver Stallybrass
Library Association, 1971
Buku Teks
Chandos, 2015
eBooks
Kahn, Miriam B., author
[American Management Association, ], 2008
eBooks
Masda Ulfa Arianti, author
Fakultas Teknik Universitas Indonesia, 2014
UI - Tugas Akhir