Blackwell Publishers for the United Nations Industrial Development Organization, 1992
Buku Teks
Schmidt, Frank W., author
McGraw-Hill, 1981
Buku Teks
Sela, Jona J., editor
Springer, 2012
eBooks
edited by Peter Roberts and Hugh Sykes
Sage, 2003
Buku Referensi
edited by Peter Roberts, Hugh Sykes
Sage Publications, 2003
Buku Referensi