Arnold, Dieter
Princeton University Press, 2003
Buku Referensi
Brackman, Rabbi Levi
American Management Association;, 2008
eBooks
Lear, Jonathan
Routledge, 2005
Buku Teks SO
Turner, Ralph
McGraw-Hill, 1941
Buku Teks SO
Simatupang, Aldo Gadra Paulus
2020
UI - Makalah dan Kertas Kerja