1. Sharman, G. B., in Delayed Implantation, edit. by Enders, A. C., 3 (University of Chicago Press, 1963).
2. Tyndale-Biscoe, C. H., in Delayed Implantation, edit. by Enders, A. C., 15 (University of Chicago Press, 1963).
3. Sharman, G. B., Austral. J. Zool., 3, 56 (1955).
4. Sharman, G. B., and Calaby, J. H., C.S.I.R.O. Wildl. Res., 9, 58 (1964).
5. Shield, J. W., and Woolley, P., Proc. Zool. Soc. Lond., 141, 783 (1963).