Jacquelin Burgess and John R. Gold.
Routledge , 2016
Buku Teks
Botkin, Daniel B.
John Wiley & Sons, 1995
Buku Teks
Botkin, Daniel B.
John Wiley & Sons, 2000
Buku Teks
Botkin, Daniel B.
John Wiley & Sons, 2003
Buku Teks
general editor Norman Myers ; foreword by Gerald Durrell ; featuring an extra chapter by Oxfam
Gaia Books, 1994
Buku Teks