Gaya APA
Cohen, D, S., Kotter, J, P.
(1947).
The heart of change
.
United States of Amerika:
Harvad Busiess.
Gaya MLA
Cohen, Dan, S.., Kotter, John, P..
"The heart of change".
United States of Amerika:
Harvad Busiess,
1947.
UMUM.