Sherman, Eliot H.
[American Management Association;, ], 2011
eBooks
Bogen, Jules I.
Alexander Hamilton Institute, 1961
Buku Teks
Osborn, Richards C.
Harper & Brothers, 1959
Buku Teks
Rose, T.G.
Sir Isaac Pitman & Sons, Ltd., 1959
Buku Teks
Baker, Richard E.
McGraw-Hill, 1999
Buku Referensi