Cooper, Phillip J., author
Thomson Wadsworth, 2005
Buku Teks
Denhardt, Robert B., author
Thomson, 2009
Buku Teks
Milakovich, Michael E., author
Wadsworth and Cengage Learning, 2009
Buku Teks
Nigro, Felix A., author
Harper and Row , 1977
Buku Teks
White, Leonard D., author
Macmillan, 1955
Buku Teks