Artikel Jurnal
Sinclair, Stuart W.
Croom Helm, 1978
Buku Teks
Edward Arnold (Publishers) Ltd., 1978
Buku Teks
Knapp, Rudiger, author
Fischer, 1973
Buku Teks
Resa Surya Utama, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
UI - Tesis (Membership)