National water well Association. (1985). Well drilling manual. National water well Association.
Chicago Stili AlıntıNational water well Association. Well Drilling Manual. India: National water well Association, 1985.
MLA AlıntıNational water well Association. Well Drilling Manual. National water well Association, 1985.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..