Veatch, Robert M., author
Oxford University Press, 2015
Buku Teks
Duncan, Peter, author
Sage, 2014
Buku Teks
Watt, Helen, author
Routledge , 2000
Buku Teks
Wanda Teays, Laura M. Purdy, editor
Wadsworth, 2000
Buku Teks
Mabie, Margot C.J.
Atheneum , 1993
Buku Teks