Boveri, Margret
G. P. Putnam's Son, 1963
Buku Teks
Ward, A.C.
The English Language Book, 1928
Buku Teks
Gossel, Peter, author
Taschen, 2001
Buku Teks
Findley, Carter V., author
Wadsworth and Cengage Learning, 2011
Buku Teks
edited by Chang Yun-Shik, steven hugh Lee
Routledge, 2006
Buku Teks