Palmer, Marilyn
Routledge, 1998
Buku Teks
edited by Lyle F. Albright, Billy L. Crynes, William H. Corcoran
Academic Press, 1983
Buku Teks
Woodward, Joan
Oxford University Press, 1965
Buku Teks
editor, Roop K. Khar, S.P. Vyas, Farhan J. Ahmad, Gaurav K. Jain
CBS Publishers, 2014
Buku Teks
Satterfield, Charles N.
McGraw-Hill , 1991
Buku Teks