एपीए उद्धरण

National water well Association. (1985). Well drilling manual. National water well Association.

शिकागो स्टाइल उद्धरण

National water well Association. Well Drilling Manual. India: National water well Association, 1985.

एमएलए उद्धरण

National water well Association. Well Drilling Manual. National water well Association, 1985.