Hans-Werner Franz, editor
Challenge social innovation : potentials for business, social entrepreneurship, welfare and civil society
[, Springer], 2012
 eBooks
Aubrey, Henry G.
Coexistence: economic challenge and response
National Planning Association, 1961
 Buku Teks
International business : the challenge of global competition
by Donald A. Ball ... [and others]
Irwin, McGraw-Hill, 2002
 Buku Teks
Ball, Donald A.
International business : the challenge of global competition
Irwin, McGraw-Hill, 2002
 Multimedia
Ball, Donald A.
International business : the challenge of global competition
McGraw-Hill, 2002
 Multimedia