A. I.  Miller, ?Bivalves?, in Evolutionary trends, K. J.  McNamara, Ed. London: Belhaven Press, 1990, pp. 143-161.

M. L.  McKinney, ?Classifying and analyzing evolutionary trends?, in Evolutionary trends, K. J.  McNamara, Ed. London: Belhaven Press, 1990, pp. 28-58.

K. J.  McNamara, ?The role of heterochrony in evolutionary trends?, in Evolutionary trends, K. J.  McNamara, Ed. London: Belhaven Press, 1990, pp. 59-74.

S. Jay Gould, ?Speciation and sorting as the source of evolutionary trends, or 'things are seldom what they seem'?, in Evolutionary trends, K. J.  McNamara, Ed. London: Belhaven Press, 1990, pp. 3-27.