J. S.  Bullivant, ?Direct observation of spawning in the blacklip pearl shell oyster (Pinctada margaritifera) and the thorny oyster (Spondylus sp.)?, Nature, vol. 193, pp. 700-701, 1962.

J. S.  Bullivant, ?Direct observation of spawning in the blacklip pearl shell oyster (Pinctada margaritifera) and the thorny oyster (Spondylus sp.)?, Nature, vol. 193, pp. 700-701, 1962.