Dyfyniad APA

Feather, R. M., & Snyder, S. L. (1999). Glencoe earth science. Glencoe/McGraw Hill.

Dyfyniad Arddull Chicago

Feather, Ralph M., and Susan Leach Snyder. Glencoe Earth Science. New york: Glencoe/McGraw Hill, 1999.

Dyfyniad MLA

Feather, Ralph M., and Susan Leach Snyder. Glencoe Earth Science. Glencoe/McGraw Hill, 1999.

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