Gaya APA
HALE, G, A. (1996).
THE LEADER'S EDGE: Mastering the 5 Skills of Breakthrough Thinking / Guy Hale .
USA:
McGraw-Hill Book Company.
Gaya MLA
HALE, Guy, A..
"THE LEADER'S EDGE: Mastering the 5 Skills of Breakthrough Thinking / Guy Hale".
USA:
McGraw-Hill Book Company,
1996.
Text.