Belgard, William P.
[American Management Association;, ], 2004
eBooks
McClelland, David Clarence
The Free Press, 1967
Buku Teks
McClelland, David Clarence
Vakils, Feffer and Simon Private, 1961
Buku Teks
Bintang Suradi
League of People?s Culture, 1962
Buku Teks
Hornby, Albert Sydney
Oxford University Press; Geoffrey Cumberlege, 1952
Buku Referensi