APA Style
Das, B, M., Sobhan, K. (2016, 2019).
Principles of Geotechnical Engineering (8th Edition & 10th Edition).
Delhi:
Cengage Learning.
MLA Style
Das, Braja, M.., Sobhan, Khaled.
"Principles of Geotechnical Engineering".
8th Edition & 10th Edition
Delhi:
Cengage Learning,
2016, 2019.
Text.