Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.