Sivarajan, V. V. Introduction to the principles of plant taxonomy / V. V. Sivarajan ; edited by N. K. P. Robson. - 2nd ed. - Cambridge : Cambridge University Press, 1991. - 292 p. ; 24 cm. p. 223-272. ISBN: 0521355877 RM208.15 Subjects--Topical Terms: Botany--Classification.