Jeffry Andreas
Fakultas Ekonomi dan Bisinis Universitas Indonesia, 2021
UI - Skripsi Membership
Omar, Ogenyi
Financial Times Management, 1999
Buku Teks SO
Cox, Roger
Financial Times Prentice Hall, 2000
Buku Teks SO
Din, Rasshied
Conran Octopus, 2000
Buku Referensi
Berman, Barry
Prentice-Hall, 2001
Buku Teks SO