Dawkins Dr.Karen, Doughty Janet, Long Bonita, Madrazo Dr.Gerry, Moody Cherlye, Russ Rachel, & Wallace Dr.Josephine. (1999). North Carolina Case Studies Science Voyages.Grade 7. American: McGraw-Hill.
Dyfyniad Arddull ChicagoDawkins Dr.Karen, Doughty Janet, Long Bonita, Madrazo Dr.Gerry, Moody Cherlye, Russ Rachel, và Wallace Dr.Josephine. North Carolina Case Studies Science Voyages.Grade 7. American: McGraw-Hill, 1999.
Dyfyniad MLADawkins Dr.Karen, et al. North Carolina Case Studies Science Voyages.Grade 7. American: McGraw-Hill, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.