edited by M. David Ermann, Mary B. Williams and Claudio Gutierrez
Oxford University Press, 1990
Buku Teks
edited by Paul Barry Clarke, Andrew Linzey
Routledge, 1996
Buku Referensi
Elsevier Science Inc., 660, 2018
Majalah, Jurnal, Buletin
Thompson Gale, 2005
Buku Teks
Reynolds, George Walter, 1944-
Cengage Learning, 2019
Buku Teks