Dyfyniad APA

Matthews, W. H. I. 1., Roy, C. J., Stevenson, R. E., & Harris, M. F. (1987). Investigating the earth. Houghton Mifflin.

Dyfyniad Arddull Chicago

Matthews, William H. III. 119-1991, Chalmer J. Roy, Robert E. Stevenson, and Miles F. Harris. Investigating the Earth. Boston: Houghton Mifflin, 1987.

Dyfyniad MLA

Matthews, 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.