Gaya APA
WYLLIE, D, C, A, M, C, W.
(2004).
Rock Slope Engineering Civil and Mining 4th Edition
.
:
Spon Press.
Gaya MLA
WYLLIE, Duncan, C., And, MAH,, Christopher, W..
"Rock Slope Engineering Civil and Mining 4th Edition".
:
Spon Press,
2004.
Buku.