Nettle, Daniel, author
Oxford Univesity Press, 2009
Buku Teks
Brace, C. Loring, author
Macmillan, 1969
Buku Teks
Clark, Wilfrid E. Le Gros, author
Quadrangle Books, 1971
Buku Teks
Bauer, Raymond A., author
Harvard University Press, 1952; 1959
Buku Teks
Boughey, Arthur S., author
McMillan Publisher, 1975
Buku Teks