Gaya APA
Gordon, Leland J.. (1950).
Elementary Economics .
USA:
American Book Company.
Gaya Chicago
Gordon, Leland J..
Elementary Economics.
USA:
American Book Company,
1950.
Text.
Gaya MLA
Gordon, Leland J..
Elementary Economics.
USA:
American Book Company,
1950.
Text.
Gaya Turabian
Gordon, Leland J..
Elementary Economics.
USA:
American Book Company,
1950.
Print.