Waldman, Don E., author
Pearson, 2007
Buku Teks
Palmer, Marilyn, author
Routledge, 1998
Buku Teks
edited by Lyle F. Albright, Billy L. Crynes, William H. Corcoran
Academic Press, 1983
Buku Teks
Woodward, Joan, author
Oxford University Press, 1965
Buku Teks
editor, Roop K. Khar, S.P. Vyas, Farhan J. Ahmad, Gaurav K. Jain
CBS Publishers, 2014
Buku Teks