Temes, Roberta, author
Irvington, 1984
Buku Teks
Temes, Roberta, author
American Management Association, 2009
eBooks
edited by Andrew Blake
Routledge, 1999
Buku Teks
Carroll, Stephen
Dorling Kindersley , 1992
Buku Referensi
Hendriks, Jean Harris
Routledge , 1993
Buku Teks