Man, Che, author
International Labour Office, 1993
Buku Teks
Dikshith, T. S. S., 1932-, author
CRC Press, 2011
Buku Teks SO
edited by David R. Morgan
Edward Arnold, 1992
Buku Teks
edited by David R. Morgan
Published on behalf of the British Medical Association by Edward Arnold, 1992
Buku Referensi
Lankester, Ted, author
Macmillan, 1994
Buku Referensi