Travel behaviour research the leading edge
David Hensher
Pergamon Press, 2001
 Buku Teks SO
The Leading Edge
The Society of Exploration Geophysicists,
 Majalah, Jurnal, Buletin
SEG Annual report : The leading edge
Tahunan
 Majalah, Jurnal, Buletin
Customer services in the National Library of Australia: leading edge or dragging the chain?
 Artikel Jurnal
Perkins, Dennis N.T.
Leading at the edge: leadership lessons from the extraordinary saga of Shackleton's Antarctic expedition
[American Management Association, ], 2000
 eBooks