Ingram, Robert W., author
South-Western Publishing, 2004
Buku Teks
Marwala, Tshilidzim, author
Springer-Verlag, 2012
eBooks
Hampton, John J., 1942-, author
Prentice-Hall, 1989
Buku Teks
editors, David A. Elizondo, Agusti Solanas, Antoni Martınez-Balleste
Springer, 2012
eBooks
by Kevin E. Voges .. .[et al.]
Idea Group, 2006
Buku Teks