Gaya APA
Samuelson, Paul A, Nordhaus, William D. (1989).
Economics (13e).
New York:
McGraw Hill.
Gaya Chicago
Samuelson, Paul A, Nordhaus, William D.
Economics.
13e
New York:
McGraw Hill,
1989.
Buku.
Gaya MLA
Samuelson, Paul A, Nordhaus, William D.
Economics.
13e
New York:
McGraw Hill,
1989.
Buku.
Gaya Turabian
Samuelson, Paul A, Nordhaus, William D.
Economics.
13e
New York:
McGraw Hill,
1989.
Buku.