Dyfyniad APA

Murphy, B., & Brendan Murphy; Damian Nance. (1999). Earth science today. Pacific Grove, Calif: Brooks/Cole.

Dyfyniad Arddull Chicago

Murphy, Brendan, và Brendan Murphy; Damian Nance. Earth Science Today. Pacific Grove, Calif: Brooks/Cole, 1999.

Dyfyniad MLA

Murphy, Brendan, và Brendan Murphy; Damian Nance. Earth Science Today. Pacific Grove, Calif: Brooks/Cole, 1999.

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