Knapp, B. (2003). Science in our world. Regency publishing.
Dyfyniad Arddull ChicagoKnapp, Brian. Science in Our World. Monterey: Regency publishing, 2003.
Dyfyniad MLAKnapp, Brian. Science in Our World. Regency publishing, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.