Voland, Gerard
Prentice-Hall, 1986
Buku Teks
Reid, J. Gary, author
McGraw-Hill, 1983
Buku Teks
Blanchard, Benjamin S., author
Prentice-Hall, 1998
Buku Teks
Blanchard, Benjamin S., author
Pearson Education Limited, 2014
Buku Teks
Blanchard, Benjamin S., author
Prentice-Hall, 2006
Buku Teks