Eun, Cheol S., author
McGraw-Hill/Irwin, 2004
Buku Teks
Bekaert, Geert, author
Essex Pearson, 2014
Buku Teks
edited by W. Arthur Cullman and Harry R. Knudson
Prentice-Hall, 1972
Buku Teks
Madura, Jeff, author
South-Western College, 1998
Buku Teks
Rodriguez, Rita M., author
Prentice-Hall, 1979
Buku Teks