edited by Harry R. Warfel, Ralph Gabriel
American Book Company, 1963
Buku Teks SO
Raheb-Mol, Joanne.
Oxford University Press, 1998
Buku Referensi
Flanagan, Owen J.
MIT Press, 1991
Buku Teks
Leaf, Murray J.
Columbia University Press, 1979
Buku Teks SO
Humprey, Nicholas
New York Springer-Verlag , 1999
Buku Teks SO