Michael J. Singer. (2002). Soils an introduction. New Jersey: Prentice Hall.
Chicago Style aipamenaMichael J. Singer. Soils an Introduction. New Jersey: Prentice Hall, 2002.
MLA aipamenaMichael J. Singer. Soils an Introduction. New Jersey: Prentice Hall, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.