Hitt, Michael A., author
RajaGrafindo Persada, 2002
Buku Teks
Mikkelsen, Britha, author
Yayasan Pustaka Obor Indonesia, 2011
Buku Teks
Fairbairn, Gavin J., author
Indeks, 2006
Buku Teks
editor, Made W. Wiratma
International Development Program of Australian Universities and Colleges : Australian Education Centre, [date of publication not identified]
Buku Referensi
Dale, Margaret, author
Gramedia, 2003
Buku Teks