Elizabeth Arista Miranti Prahasti, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Makalah dan Kertas Kerja
Lovelock, Christopher H., author
McGraw-Hill, 1994
Buku Teks
Brown, Stanley A., author
Prentice-Hall, 1992
Buku Teks
Bendell, Tony, author
Elex Media Komputindo, 2000
Buku Teks
Porter, Michael E., author
The Free Press , 1990
Buku Teks