Gaya APA
SPIGOLON, J, S. (2001).
Geotechnical engineering; The Mc Graw Hill civil engineering PE exam depth guide .
:
McGraw Hill.
Gaya MLA
SPIGOLON, Joseph, S.
"Geotechnical engineering; The Mc Graw Hill civil engineering PE exam depth guide".
:
McGraw Hill,
2001.
Buku.