एपीए उद्धरण

Das, B. M. (2019). Principles of foundation engineering. Cengage Learning.

शिकागो स्टाइल उद्धरण

Das, Braja M. Principles of Foundation Engineering. Cengage Learning, 2019.

एमएलए उद्धरण

Das, Braja M. Principles of Foundation Engineering. Cengage Learning, 2019.