APA
Das B. M., Sobhan K., . (1985). Principles of Geotechnical Engineering. Delhi: Library of Congress Cataloging in Publication Data.
Chicago
Das Braja M, Sobhan Khaled, . 1985. Principles of Geotechnical Engineering. Delhi: Library of Congress Cataloging in Publication Data.
Harvard
Das B. M., Sobhan K., . (1985). Principles of Geotechnical Engineering. Delhi: Library of Congress Cataloging in Publication Data.
MLA
Das Braja M, Sobhan Khaled, . Principles of Geotechnical Engineering. Delhi: Library of Congress Cataloging in Publication Data. 1985.