Emenike O. Kalu, author
Rhema University Nigeria, Department of Banking and Finance, 2015
Artikel Jurnal
Staniland, Martin, author
RajaGrafindo Persada, 2003
Buku Teks
Natalia, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
Artikel Jurnal
Schiller, Bradley R., author
Prentice-Hall, 1989
Buku Teks
Weber, Max, 1864-1920, author
University of California press, 1978
Buku Teks