एपीए उद्धरण

Attewell, P. B., & Farmer, I. W. (1976). Principles of Engineering Geology. Chapman & Hall.

शिकागो स्टाइल उद्धरण

Attewell, P. B., और I. W. Farmer. Principles of Engineering Geology. London: Chapman & Hall, 1976.

एमएलए उद्धरण

Attewell, P. B., और I. W. Farmer. Principles of Engineering Geology. Chapman & Hall, 1976.