Stein, Eric
The Bobbs-Merrill , 1963
Buku Teks
Herter, Christian A., author
Harper & Row, 1963
Buku Teks
Edited by Heike Krieger, Assist editor Jan Willms
Cambridge University Press, 2015
Buku Teks
Dalton, Heather, author
Oxford University Press, 2016
eBooks
Brown, E.D., author
Dartmouth, 1994
Buku Teks