, ?Gramineae?, in Flora Europea, vol. 5, V. H.  Heywood and al, et, Eds. Cambridge: Cambridge University Press, 1980, pp. 118-267.

C. J.  Humphries and Funk, V. A., ?Cladistic methodology?, in Current concepts in plant taxonomy, V. H.  Heywood and Moore, D. M., Eds. Academic Press, 1982.

V. H.  Heywood, ?The mythology of taxonomy?, Transactions of the Botanical Society of Edinburgh, vol. 44, pp. 79-94, 1983.

V. H.  Heywood, Brummitt, R. K., Culham, A., and Seberg, O., Flowering Plant Families of the World. Firefly Books, Buffalo, New York, 2007.

P. H.  Davis and Heywood, V. H., Principles of Angiosperm Taxonomy. Edinburgh & London: Oliver & Boyd, 1963, p. 556.

W. D.  Clayton, ?Gramineae?, in Flowering Plants of the World, V. H.  Heywood, Ed. Mayflower Books, New York, 1978, pp. 285-290.