Park, Chris C.
Routledge, 1992
Buku Teks
edited by Mark Collins ; foreword by David Attenborough
Oxford University Press, 1990
Buku Teks
Newman, Arnold
Fact on File, 1990
Buku Teks
Agustinus Murdjoko, author
Seameo Biotrop, 2017
Artikel Jurnal
World Health Organization, [date of publication not identified]
Buku Teks