Oxford University, 1968
Buku Teks
Lele, R.D., author
Tata McGraw-Hill, 1993
Buku Teks
Kember. N.F., author
Edward Arnold, 1984
Buku Teks
Abramson, J. H. (Joseph Herbert), 1924-, author
Oxford University Press, 1983
Buku Teks
Doenges, Marilynn E., author
FA Davis, 1997
Buku Teks