Gaya APA
Foundation design. (1981).
New Delhi:
prentice-hall.
Gaya Chicago
Foundation design.
.
New Delhi:
prentice-hall,
1981.
Buku.
Gaya MLA
Foundation design.
.
New Delhi:
prentice-hall,
1981.
Buku.
Gaya Turabian
Foundation design.
New Delhi:
prentice-hall,
1981.
Buku.