Herodotus
The histories
Everyman's Library, 1997
 Buku Referensi
Ethical issues in social work
edited by Richard Hugman, David Smith
Routledge, 1996
 Buku Teks
Dolgoff, Ralph
Ethical decisions for social work practice
Thomson Brooks/Cole, 2012
 Buku Teks
Rhodhes, Margaret L.
Ethical dilemmas in social work practice
Routledge and Kegan Paul, 1986
 Buku Teks
Histories of the Borneo environment: economic, political and social dimensions of change and continuity
edited by Reed L. Wadley
KITLV Press , 2005
 Buku Teks