Kogan Page, 1997
Buku Referensi
Roberta Carroll
Jossey-Bass, 2011
Buku Teks
Roberta Carroll
Jossey- Bass, 2011
Buku Teks
edited by Kieran Walshe and Judith Smith
Open University Press, 2006
Buku Teks
edited by Kieran Walshe and Judith Smith
McGraw-hill Open Univer, 2011
Buku Teks