Mitchell, Ewan
The executive's guide to successful speechmaking
Vertex Books, 1970
 Buku Teks SO
McGonagle, John J.
Proactive intelligence: the successful executive’s guide to intelligence
Springer, 2012
 eBooks
Mahoney, Thomas A.
Building the executive team : a guide to management development
Prentice-Hall, 1961
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Chambers, John Carlton, 1928-
An Executive's guide to forecasting
John Wiley & Sons, 1974
 Buku Teks
Chambers, John Carlton, 1928-
An executive's guide to forecasting
John Wiley & Sons, 1974
 Buku Teks