Of males and females: Sex Ratios. Concepts and Research Methods edited by Ian C.W. Hardy. Cambridge University Press, 2002. £32.95 pbk (xii+424 pages) ISBN 0 521 66578 7.: Sex Ratios. Concepts and Research Methods edited by Ian C.W. Hardy. Cambridge University Press, 2002. £32.95 pbk (xii+424 pages) ISBN 0 521 66578 7.