Gaya APA
Berhard, Richard C.. (1954).
Economics .
Hoboken, NJ:
D. C. Heath and Company.
Gaya Chicago
Berhard, Richard C..
Economics.
Hoboken, NJ:
D. C. Heath and Company,
1954.
.
Gaya MLA
Berhard, Richard C..
Economics.
Hoboken, NJ:
D. C. Heath and Company,
1954.
.
Gaya Turabian
Berhard, Richard C..
Economics.
Hoboken, NJ:
D. C. Heath and Company,
1954.
.