Gaya APA
Gray, Lewis Cecil. (1927).
Introduction to agricultural economics .
New York:
The Macmillan Company .
Gaya Chicago
Gray, Lewis Cecil.
Introduction to agricultural economics.
New York:
The Macmillan Company ,
1927.
Text.
Gaya MLA
Gray, Lewis Cecil.
Introduction to agricultural economics.
New York:
The Macmillan Company ,
1927.
Text.
Gaya Turabian
Gray, Lewis Cecil.
Introduction to agricultural economics.
New York:
The Macmillan Company ,
1927.
Print.