Spencer, E. W. (1969). Introduction to the structure of the earth. McGraw-Hill.
Dyfyniad Arddull ChicagoSpencer, Edgar W. Introduction to the Structure of the Earth. New York: McGraw-Hill, 1969.
Dyfyniad MLASpencer, Edgar W. Introduction to the Structure of the Earth. McGraw-Hill, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.