Careless, J.M.S., author
Canada a story of challenge
Macmillan, 1959
 Buku Teks
Careless, J.M.S., author
Canada : a story of challenge
Cambridge University Press, 1953
 Buku Teks
Careless, J.M.S., author
Canada : a story of challenge
Macmillan, 1984
 Buku Teks
Mahathir bin Mohamad, 1925-, author
The challenge
Pelanduk Publications, 1986
 Buku Teks
Kouzes, James M., author
The leadership challenge
Jossey-Bass, 2002
 Buku Teks
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