Artikel Jurnal
Dewi Safitri, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Tesis (Membership)
Orford, Jim, author
John Wiley & Sons, 1992
Buku Teks
Nelson, Geoffrey, author
Palgrave, 2005
Buku Teks
Behavioral Publ., 1980
Buku Teks