Gaya APA
Copi, Irving M.. (1978).
Introduction to logic (6th ed).
New York:
Macmillan.
Gaya Chicago
Copi, Irving M..
Introduction to logic.
6th ed
New York:
Macmillan,
1978.
Text.
Gaya MLA
Copi, Irving M..
Introduction to logic.
6th ed
New York:
Macmillan,
1978.
Text.
Gaya Turabian
Copi, Irving M..
Introduction to logic.
6th ed
New York:
Macmillan,
1978.
Print.