Emerson, Rupert, author
Harvard University Press, 1967
Buku Teks
Dains, Joyce E. , author
Elsevier, 2012
Buku Teks
Butler, David
National University, 1972
Buku Teks
Schippers, Birgit, author
Routledge, 2014
Buku Teks
Arms, Karen, author
Saunders College, 1982
Buku Teks