Sallah, David, author
Elsevier , 2005
Buku Teks
LIPI - Press, 2007
Buku Referensi
edited by Georg Hass, Maurice H. Francombe, John L. Vossen
Academic Press , 1982
Buku Teks
Pratt, Brian, author
Oxfam, 1992
Buku Teks
edited by R. Murray Thomas
Pergamon Press, 1990
Buku Referensi