Harmon, Paul, author
Elsevier Saunders, 2014
Buku Teks
Quirk, Thomas J., author
Springer, 2012
eBooks
Harmon, Paul, author
Elsevier, 2014
eBooks
edited by Stephen Clarke
Harper Collins, 1992
Buku Referensi
Fraser, Jill Andresky, author
Bloomberg Press, 2002
Buku Teks