Shaw, Beth
Springer, 2012
eBooks
Bowler, Sue
Erlangga, 2003
Buku Teks
Chester, Roy
American Management Association, 2008
eBooks
Ballard, Robert D.
National Geographic Society, 1983
Buku Referensi
Faundra Ihsan Pratama
Fakultas Teknik Universitas Indonesia, 2020
UI - Skripsi Membership