Handler, Milton
University Casebook, 1972
Buku Teks
Velasquez, Manuel G
Prentice-Hall, 2002
Buku Teks
Velasquez, Manuel G., author
Pearson, 2014
Buku Teks
Alt, Richard M., author
Richard D. Irwin, 1955
Buku Teks
Litvak, Isaiah A., author
McGraw-Hill Ryerson, 1984
Buku Teks