Gaya APA
BEER, M. (2011).
HIGHER AMBITION HOW GREAT LEADER CREATE ECONOMIC and SOCIAL VALUE .
USA:
HARVARD BUSINESS REVIEW PRESS.
Gaya MLA
BEER, MICHAEL.
"HIGHER AMBITION HOW GREAT LEADER CREATE ECONOMIC and SOCIAL VALUE".
USA:
HARVARD BUSINESS REVIEW PRESS,
2011.
Buku Inti.