Gaya APA
MACRIDIS, R, C., WARD, R, E.
(1968).
Modern political systems :
.
Englewood Cliffs:
Prentice Hall.
Gaya MLA
MACRIDIS, Roy, C.., WARD, Robert, E..
"Modern political systems :".
Englewood Cliffs:
Prentice Hall,
1968.
Buku.