Gaya APA
DAS, B, M., SIVAKUGAN, N. (2016).
Introduction to geotechnical engineering (2nd ed.).
Australia:
CENGAGE Learning.
Gaya MLA
DAS, Braja, M.., SIVAKUGAN, Nagaratnam.
"Introduction to geotechnical engineering".
2nd ed.
Australia:
CENGAGE Learning,
2016.
Buku.