APA aipamena

HOLTZ, R. D., & KOVACS, W. D. (1981). An introduction to geotechnical engineering. Prentice-hall.

Chicago Style aipamena

HOLTZ, Robert D., and William D. KOVACS. An Introduction to Geotechnical Engineering. New Jersey: Prentice-hall, 1981.

MLA aipamena

HOLTZ, Robert D., and William D. KOVACS. An Introduction to Geotechnical Engineering. Prentice-hall, 1981.