Dyfyniad APA
Das, B. M., & Sobahan, K. (2018). Principles of Geotechnical Engineering (9th ed.). Cengage Learning.
Dyfyniad Arddull Chicago
Das, Braja M., and Khaled Sobahan. Principles of Geotechnical Engineering. 9th ed. New Delhi: Cengage Learning, 2018.
Dyfyniad MLA
Das, Braja M., and Khaled Sobahan. Principles of Geotechnical Engineering. 9th ed. Cengage Learning, 2018.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.