Gaya APA
Warren, H, G., Leineweber, H, D.
(1963).
Our Democracy at Work
.
Amerika:
PRENTICE HALL _2.
Gaya MLA
Warren, Harris, G.., Leineweber, Harry, D..
"Our Democracy at Work".
Amerika:
PRENTICE HALL _2,
1963.
Buku Teks.