Gaya APA
WYLLIE, D, C, A, M, C, W. (2007).
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,
2007.
Buku.