Assimakopoulos, Dimitris G., editor
Springer, 2012
eBooks
Magstadt, Thomas M., author
Thomson wadsworth, 2005
Buku Teks
Heady, Ferrel
Prentice-Hall, 1966
Buku Teks
Heady, Ferrel
Marcel Dekker, 1991
Buku Teks
Mulder, Niels, author
Gadjah Mada University Press, 1983
Buku Teks