APA
Robert D. Holtz, . (1981). Introduction to Geotechnical Engineering. New Jermony: Prentice Hall.
Chicago
Robert D. Holtz, . 1981. Introduction to Geotechnical Engineering. New Jermony: Prentice Hall.
Harvard
Robert D. Holtz, . (1981). Introduction to Geotechnical Engineering. New Jermony: Prentice Hall.
MLA
Robert D. Holtz, . Introduction to Geotechnical Engineering. New Jermony: Prentice Hall. 1981.