APA Style
Principles of economics. (1970).
New York:
Harper and Row Publishers.
Chicago Style
Principles of economics.
.
New York:
Harper and Row Publishers,
1970.
Text.
MLA Style
Principles of economics.
.
New York:
Harper and Row Publishers,
1970.
Text.
Turabian Style
Principles of economics.
New York:
Harper and Row Publishers,
1970.
Print.