Christian Soe
McGraw-Hill, 2004
Buku Teks
Barringron, Lowell
Wadsworth and Cengage Learning, 2013
Buku Teks
Chilcote, Ronald H.
Routledge, 2000
eBooks
McCormick, John, 1954-
Thomson Wadsworth, 2004
Buku Teks
Fried, Robert C.
Prentice-Hall, 1980
Buku Teks