Dance, S. P. (1976). The collector's encyclopedia of shells (2d ed.). McGraw-Hill.
Dyfyniad Arddull ChicagoDance, S. Peter. The Collector's Encyclopedia of Shells. 2d ed. New York: McGraw-Hill, 1976.
Dyfyniad MLADance, S. Peter. The Collector's Encyclopedia of Shells. 2d ed. McGraw-Hill, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.