Gaya APA
Leland, B. (1971).
Economics an Introduction to Analysis and Policy (7).
New Jersey:
Prentice-Hall,Inc,Englewood Clifs.
Gaya MLA
Leland, BACH,George.
"Economics an Introduction to Analysis and Policy".
7
New Jersey:
Prentice-Hall,Inc,Englewood Clifs,
1971.
Text.