Hill, Ernestine
Angus and Robertson, 1961
Koleksi Publik
Dobson, Rosemary
Angus & Robertson, 1978
Buku Teks
Morrison, Tony
Vintage Books, 2003
Buku Teks
Winfeld, Liz
[American Management Association;, ], 2001
eBooks
Hogrefe and Huber , 1993
Buku Teks