Gaya APA
Ackermann, R, J. (-1970).
Modern deductive logic, an introduction to its techniques and to its significance. .
(London):
Macmillan.
Gaya MLA
Ackermann, Robert, John..
"Modern deductive logic, an introduction to its techniques and to its significance. ".
(London):
Macmillan,
-1970.
Buku.