Gaya APA
Drucker, Peter F. (1999).
Management challenges fort the 21st century .
New York:
Harper Collins Publ..
Gaya Chicago
Drucker, Peter F.
Management challenges fort the 21st century.
New York:
Harper Collins Publ.,
1999.
Buku.
Gaya MLA
Drucker, Peter F.
Management challenges fort the 21st century.
New York:
Harper Collins Publ.,
1999.
Buku.
Gaya Turabian
Drucker, Peter F.
Management challenges fort the 21st century.
New York:
Harper Collins Publ.,
1999.
Buku.