Stewart, Rosemary, author
Pan Books, 1967
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 2002
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 1997
Buku Teks
Hitt, Michael A., author
Pearson, 2009
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 1999
Buku Teks