edited by Sally C. Reynolds, Andrew Gallaghe
Cambridge University Press, 2012
Buku Teks
Howells, William D.
Doubleday, 1967
Buku Teks
Brace, C. Loring
Prentice-Hall, 1979
Buku Teks
edited by Eric Delson, Ian Tattersall, John A. Van Couvering and Alison S. Brokks
Garland Publishing, 2000
Buku Referensi
Volpe, E. Peter (Erminio Peter)
Universal Books Stall, 1996"
Buku Teks