Gaya APA
Copi, Irving M., Cohen, Carl. (1990).
Introduction to logic (8th ed.).
New York:
MacMillan Publishing.
Gaya Chicago
Copi, Irving M., Cohen, Carl.
Introduction to logic.
8th ed.
New York:
MacMillan Publishing,
1990.
Text.
Gaya MLA
Copi, Irving M., Cohen, Carl.
Introduction to logic.
8th ed.
New York:
MacMillan Publishing,
1990.
Text.
Gaya Turabian
Copi, Irving M., Cohen, Carl.
Introduction to logic.
8th ed.
New York:
MacMillan Publishing,
1990.
Print.