Gerald, Michael C.
Prentice-Hall, 1981
Buku Teks
Gerald, Michael C.
Prentice-Hall, 1981
Buku Teks
edited by William B. Pratt and Palmer Taylor
Churchill Livingstone, 1990
Buku Teks
Graham, J. D. P.
Oxford University Press, 1979
Buku Teks
Anderson, Philip O.
McGraw-Hill, 2002
Buku Referensi