Matthews, W. H. I. 1., Roy, C. J., Stevenson, R. E., & Harris, M. F. (1987). Investigating the earth. Houghton Mifflin.
Dyfyniad Arddull ChicagoMatthews, William H. III. 119-1991, Chalmer J. Roy, Robert E. Stevenson, and Miles F. Harris. Investigating the Earth. Boston: Houghton Mifflin, 1987.
Dyfyniad MLAMatthews, William H. III. 119-1991, et al. Investigating the Earth. Houghton Mifflin, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.