Strong, L. A. G.
Alfred A. Knopf, 1932
Buku Teks
Armstrong, Martin
Harcourt, Brace and company, 1936
Buku Teks
Jager, Sheila Miyoshi, author
W. W. Norton & Company, 2013
Buku Teks
Armstrong, Frank Bradley
Oxford University Press, 1979
Buku Teks
Armstrong, Muriel
Prentice Hall of Canada, 1977
Buku Teks