Artikel Jurnal
edited by Anthony J. Hickey
Marcel Dekker, 2004
Buku Teks SO
edited by Denis Burley, Christobel Haward and Brenda Mullinger
Macmillan, 1988
Buku Teks SO
edited by David G. Watson
Churchill Livingstone, 2011
Buku Teks SO
Akhidatul Solekhah
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2022
UI - Skripsi Membership