Woodward, R. J., & Gardner, S. W. G. (1972). Drilled Pier Foundations. McGraw-Hill.
Chicago Style aipamenaWoodward, Richard J., and S. William Greer Gardner. Drilled Pier Foundations. New York: McGraw-Hill, 1972.
MLA aipamenaWoodward, Richard J., and S. William Greer Gardner. Drilled Pier Foundations. McGraw-Hill, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.