Morris, Michael A, author
Palgrave Macmillan, 2016
Buku Teks
edited by Malcolm Warner
Business Press, 2000
Buku Referensi
Freidel, Frank, author
McGraw-Hill, 1990
Buku Teks
Springer Berlin, Heidelberg, 2019
eBooks
Burns, Danny, 1964-
MacMiland, 22cm
Buku Teks